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': 'Lochia rubra is seen up to : \nSelect and explain. \nA. 5 days, B. 10 days, C. 15 days, D. 20 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 5 days', 'role': 'assistant'}]