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: Gynaecology & Obstetrics
[{'content': 'Menstruation is defined as precocious if it stas before the child reaches the age of : \nSelect and explain. \nA. 8 years, B. 10 years, C. 14 years, D. 20 years', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. 10 years', 'role': 'assistant'}]