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': 'Sonosalpingography is done for : \nSelect and explain. \nA. Measuring basal body temperature, B. To detect pregnancy, C. Testing tubal patency, D. Determining anovulatory cycel', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Testing tubal patency', 'role': 'assistant'}]