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: Social & Preventive Medicine
Niacin deficiency in a maize-eating population is due to- 
Select and explain. 
A. High Tryptophan, B. High lsoleucine, C. High leucine, D. High Phenylalanine
C: High leucine
Answer: C: High leucine 
Explanation: Ans. is 'c' i.e., High Leucine Excess of Leucine interferes in conversion of Tryptophan into Niacin, and aggravates the pallagrogenic action of inake.