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: Radiology
[{'content': 'Molar pregnancy can be best diagnosed by \nSelect and explain. \nA. Clinical history & examination, B. Ultrasound study, C. Laproscopy, D. CT Scan', 'role': 'user'}, {'content': 'Answer: B \nExplanation: USG is the investigation of choice for molar pregnancies.', 'role': 'assistant'}]