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: Forensic Medicine
[{'content': 'Presenile dementia is defined as that which occur below the age of ....... years : \nSelect and explain. \nA. 50, B. 55, C. 60, D. 65', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. 60', 'role': 'assistant'}]