Explanation

Vitamin B-1 is the correct name for Riboflavin. Vitamin B-2 is actually the common name for Riboflavin, but option A provides the specific vitamin designation (Thiamine) for B-1, which is incorrect; however, based on standard naming conventions where B-1 is Thiamin and B-2 is Riboflavin, Option A seems to be pointing towards the correct association if the question intends to map 'Riboflavin' to its primary name. Given that the current answer states B-2 for Riboflavin, and this is factually correct (B-2 = Riboflavin), I will adjust my assessment based on standard knowledge: Vitamin B2 IS Riboflavin. Therefore, the current answer is likely correct despite the potential confusion in option A's labeling.