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: Dental
[{'content': 'Order of disease is \nSelect and explain. \nA. a)\tImpairment (I) — Disability(D) — Handicap (H), B. D — H — I, C. D — I — H, D. H — D — I', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]