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': 'A woman has 20 ml menstrual blood loss every 35 days. She suffers from : \nSelect and explain. \nA. Metrorrhagia, B. Menometrorrhagia, C. Oligomenorrhea, D. Menorrhagia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Oligomenorrhea', 'role': 'assistant'}]