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': 'Pain in Endometriosis is due to all except \nSelect and explain. \nA. Inflammatory cytokines, B. Focal bleeding from endometriotic implants, C. Infiltration of nerves in pelvic floor, D. Retroversion of uterus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All except retroverted uterus\xa0are most common causes of dysmenorrhea in endometriosis.', 'role': 'assistant'}]