Betamethasone Valerate Cream Para Que Sirve Bioshock

I got hooked on Bioshock game recently. Today, I Was expecting to finish the game But UH-OH I could not. Just Before You Have to beat the final boss There's a thing you Must do first. You Have to take the "harvesting tool" from a little sister. Easy, right? I do not think so. It's Not That Easy if you CAN NOT take it, yes, you got it right, Because I Can not take the option is NOT available: the A button is not working Either.
I switched off the Xbox just in case. I'll try later. Wish me luck

xD Yay for this photo (extracted from here ):