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
Decarboxylation of which of the following amino acids results in formation of a vasodilator: 
Select and explain. 
A. Valine, B. Arginine, C. Histidine, D. Glutamic acid
C: Histidine
Answer: C: Histidine 
Explanation: None