This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins, Fats, Rich Sources, Subject name: Social & Preventive Medicine
[{'content': 'Limiting (deficient) amino acid in Maize is? \nSelect and explain. \nA. Tryptophan, B. Leucine, C. Threonine, D. Methionine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: LIMITING AMINO ACID is AA deficient in a food item Maize - Tryptophan & Lysine Wheat - Threonine & Lysine Pulse - Methionine & Cysteine Supplementary action of proteins: Two different food items must be eaten together.', 'role': 'assistant'}]