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
Initial amino acid in prokaryotic protein synthesis ? 
Select and explain. 
A. Arginine, B. Methionine, C. Formyl-methionine, D. Alanine
C: Formyl-methionine
Answer: C: Formyl-methionine 
Explanation: Ans. is 'c' i.e., Formyl-methionine