This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Biochemistry
A female on maize as staple diet Its diarrhea and lesion in the neck region It is deficiency of 
Select and explain. 
A. Niacin, B. Zinc, C. thiamine, D. Riboflavin
A: Niacin
Answer: A: Niacin 
Explanation: ref : lippincott 6th ed