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
Amino acid carrying ammonia from muscle to liver ? 
Select and explain. 
A. Alanine, B. Glutamin, C. Arginine, D. Lysine
A: Alanine
Answer: A: Alanine 
Explanation: Ans. is 'a' i.e., Alanine