This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
[{'content': 'Cause of unilateral dysmenorrhea \nSelect and explain. \nA. One horn of malformed uterus, B. Endometriosis with unilateral distribution, C. Small fibroid at the utero tubal junction, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Causes of unilateral dysmenorrhea : One horn of malformed uterus Endometriosis with unilateral distribution Small fibroid at the utero - tubal junction. Ovarian dysmenorrhea Right ovarian vein syndrome Colonic or caecal spasm. REF : gynecology book of shaw 17th', 'role': 'assistant'}]