This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Lochia, in its various forms, may normally persist for what time interval postpaum? \nSelect and explain. \nA. 2 weeks, B. 4 weeks, C. 6 weeks, D. 8 weeks', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Sloughing of decidual tissue results in a vaginal discharge of variable quantity. For the first few days after delivery, there is blood sufficient to color it red--lochia rubra. - After 3 or 4 days, lochia becomes progressively pale in color--lochia serosa. After approximately the 10th day, because of an admixture of leukocytes and reduced fluid content, lochia assumes a white or yellow-white color--lochia alba. - The average duration of lochial discharge ranges from 24 to 36 days', 'role': 'assistant'}]