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: Psychiatry
[{'content': 'All of the following suggests of organic disease except : \nSelect and explain. \nA. Early age onset, B. Absence of family history of psychiatric illness, C. Absence of previous history of psychiatric illness, D. Absence of any apparent psychological precipitant', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Organic disease are usually seen at older age groups.', 'role': 'assistant'}]