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
In sickle cell anemia, glutamic acid is replaced by 
Select and explain. 
A. Valine, B. Alanine, C. Glycine, D. Aspartic Acid
A: Valine
Answer: A: Valine 
Explanation: None