This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development and Epidemiology, Subject name: Pediatrics
[{'content': 'WHO defi nes adolescent age between - \nSelect and explain. \nA. 10-19 years, B. 10-14 years, C. 10-25 years, D. 9-14 years', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 10-19 years o Adolescence is usually the period 10 to 20 yr.", 'role': 'assistant'}]