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: Skin
[{'content': 'Dermatitis and alopecia are due to deficiency of: \nSelect and explain. \nA. Zinc, B. Molybodenum, C. Magnesium, D. Calcium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Zinc', 'role': 'assistant'}]