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': '14 year old girl presented with vaginal bleeding with occasional amenorrhea, next step is : \nSelect and explain. \nA. BT, CT, B. Clinical history and examination, C. Ultrasound, D. TLC, DLC ESR', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Clinical history and examination', 'role': 'assistant'}]