The general idea is to just take your vitamins. A good well rounded multi-vitamin is all you need.
The only difference will be the amount of vitamins and other 'bells and whistles' in the different brands. Some may just be a basic vitamin pack, some may be vitamins, minerals, athletes formula, etc. etc.
I don't think it matters too much to tell the truth. It's just there to cover your bases besides your food intake.