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 common symptom present in undisturbed ectopic: \nSelect and explain. \nA. Pain in lower abdomen, B. Amenorrhea, C. Bleeding PN, D. Fainting attack', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]