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': 'Most reversible form of infeility : \nSelect and explain. \nA. Anovulation, B. EndometrosisOligospermia, C. Tubal factor, D. Oligospermia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anovulation', 'role': 'assistant'}]