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': 'Ectopic pregnancy: most common feature is \nSelect and explain. \nA. Abdominal pain, B. Amenorrhea, C. Fainting attack, D. Bleeding P.V.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Abdominal pain', 'role': 'assistant'}]