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
Histidine to histamine is ? 
Select and explain. 
A. Carboxylation, B. Decarboxylation, C. Oxidation, D. Reduction
B: Decarboxylation
Answer: B: Decarboxylation 
Explanation: Ans. is 'b' i.e., DecarboxylationHistamine is synthesized from histidine by decarboxylation catalyzed by histidine decarboxylase.Reaction requires pyridoxal phosphate (PLP) as coenzyme.