This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Niacin & riboflavin help in: 
Select and explain. 
A. Redox reactions, B. Transamination reaction, C. Methyl group transfer, D. Amine group transfer
A: Redox reactions
Answer: A: Redox reactions 
Explanation: None