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
[{'content': 'Which amino acid is scarce in pulses? \nSelect and explain. \nA. Lysine, B. Threonine, C. Methionine, D. Serine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Amino acids most deficient in proteins of a food item are 'limiting amino acids'.", 'role': 'assistant'}]