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': 'Most common cause of post paum endometritis is : \nSelect and explain. \nA. E. coli, B. Gonococcus, C. Streptococcus, D. Proteus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Streptococcus', 'role': 'assistant'}]