This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adolescence, Subject name: Pediatrics
[{'content': 'WHO defines adolescent age group as \nSelect and explain. \nA. 14-21 years, B. 13-20 years, C. 10-19 years, D. 10-17 years', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The World Health Organization (WHO) defines an adolescent as any person between ages 10 and 19.', 'role': 'assistant'}]