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': 'Adjuvant used in DPT is \nSelect and explain. \nA. Aluminium, B. Magnesium, C. Manganese, D. Silica', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]