This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
[{'content': 'Polymenorrhoea Means \nSelect and explain. \nA. Menses < 21 days, B. Menses >35 days, C. Painful menses, D. DUB', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Polymenorrhoea means regular and shoened cycles Reference: Shaw&;s textbook of gynaecology; 16th edition; Page no 293', 'role': 'assistant'}]