This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Biochemistry
All are cofactors for Dehydrogenase except: 
Select and explain. 
A. NADP, B. FAD, C. NAD, D. SAM
D: SAM
Answer: D: SAM 
Explanation: Dehydrogenases - remove H2 and which is usually taken up by their cofactors: 1. FAD - FADH2 - (ETC) 2. NAD - NADH - (ETC) 3. NADP - NADPH NADPH - used in anabolic pathway - SAM (S - Adenosyl Methionine) (Donor of methyl group) is a nucleotide but not a cofactor.