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': 'Decidua in puerperium is normally shed as : \nSelect and explain. \nA. Decidual cast, B. Lochia, C. Placental remnants, D. Clots', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lochia', 'role': 'assistant'}]