This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Structure and function of protein, Subject name: Biochemistry
Creatine is made up of all, except 
Select and explain. 
A. Glycine, B. Alanine, C. Methionine, D. Arginine
B: Alanine
Answer: B: Alanine 
Explanation: Three amino acids are required in the biosynthesis of creatine. They are: (i) Glycine (ii) Arginine and (iii) Methionine Substrates to sta synthesis are Glycine and Arginine. Site: Site of synthesis * In kidney * In liverRef: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 524