Who is the most important member of Arsenal's front line?
With another defeat in the Champions League on Tuesday there are clearly problems at Arsenal but it is difficult to see why, as they appear to have so much talent going forward.
Manager Arsene Wenger has an array of attacking stars in his ranks but still lacks an out-and-out goal scorer.
Olivier Giroud could fall into that category as it is clear that he does his best work in the box but a return off 44 goals from 104 top-flight appearances, while acceptable, means he is not always going to be a threat to the opposition.
Steady, rather than spectacular, would be a way to describe the Frenchman, and it is unlikely he will get any better as he enters the peak years of his career.
The 29-year-old was more productive at his previous clubs but the Premier League is an unforgiving place and only the really best stand out.
And, in Alexis Sanchez, the north Londoners have one of the best around.
The 26-year-old scored 39 goals from 88 La Liga appearances while at Barcelona and it seemed as though Wenger was buying the finished article when he signed the Chile international in the summer of 2014.
But, like Giroud, the diminutive front man has had his dips and peaks in performance, with 16 strikes in his debut campaign, the South American has got on the scoresheet in just one match this term.
There is no doubting his quality, however, and, if he stays fit, there is every reason to suggest that the former Udinese ace will start to find the back of the net with more regularity.
He does provide assists and brings other players into the game with his pace and intelligence on the ball and is essential to any success the Gunners may have.
Theo Walcott seems to have been around forever but is still only 26 and appears to be operating more as striker these days than out on the wing.
Wenger has previous of converting players, with Thierry Henry being brought in from a wide position to score a hatful of goals from a central striking position.
Whether Walcott can do the same only time will tell as there has always been a question mark over his end product.
With only 52 goals from 214 Premier League appearances, the former Southampton man is not prolific and has only once passed double figures for a season.
But he remains an important cog in the wheel, with his blistering pace able to cut open defences.
Many fans questioned the signing of Danny Welbeck in 2014, as Wenger was looking for a man to bag 20 goals a year and, with the best will in the world, the former Manchester United man did not fit that particular bill.
Blessed with pace like Walcott, the 24-year-old also suffers from the same lack of prowess where it matters and only scored four goals from 25 league outings in his first season at the Emirates.
That is not good enough and he will need to up that rate when he returns from long-term injury.
Good rather than great would be a way to describe the current Arsenal forwards and it may well be that the boss dips into the club's transfer funds in January.
Until then, he will have to make do with what he has got and Sanchez must be the man to step up, as he is the undoubted star of the front line and the one who will strike fear into opposing teams.