This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Social & Preventive Medicine
A child was fed on staple diet of maize for a long time. Which of the following vitamin may get deficient in his body? 
Select and explain. 
A. Vitamin B1, B. Vitamin B12, C. Niacin, D. Pyridoxine
C: Niacin
Answer: C: Niacin 
Explanation: In maize eating people, Niacin deficiency is seen leading to pellagra. Maize is a deficient in tryptophan and lysine. Tryptophan is required for the synthesis of Niacin (B3). 60 mg of tryptophan produces 1mg of niacin. Pellagra-The main 3 Ds of pellagra include- Diarrhoea Dermatitis Dementia