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': 'Investigation of choice to diagnose congenital malformations \nSelect and explain. \nA. USG, B. HSG, C. MRI, D. CT', 'role': 'user'}, {'content': 'Answer: C \nExplanation: MRI is the investigation of choice to diagnose congenital malformaiton.', 'role': 'assistant'}]