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
Conversion of glycine to serine requires: 
Select and explain. 
A. Folic acid, B. Thiamine, C. Vit. C., D. Pyridoxal phosphate
A: Folic acid
Answer: A: Folic acid 
Explanation: Glycine is conveed to serine by addition of methylene group from N5, N10 -methylenetetra hydrofolic acid and requires pyridoxal phosphate as coenzyme for serine hydroxymethyl tranaferase.