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
[{'content': 'Zinc deficiency is characterized by \nSelect and explain. \nA. All of the below, B. Poor growth, C. Poor wound healing, D. Sexual infantilism', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]