This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological Disorders in Obs., Subject name: Gynaecology & Obstetrics
[{'content': 'Causes of unilateral dysmenorrhea are all except: \nSelect and explain. \nA. Rudimentary horn, B. Right ovarian vein syndrome, C. Unicornuate uterus, D. Large fundal fibroid', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Large fundal fibroid * Causes of unilateral dysmenorrhea1) Ovarian Dysmenorrhea (Right ovarian vein syndrome)2) Bicornuate uterus3) Unicornuate uterus4) Rudimentary horn5) Unilateral pelvic endometriosis6) Small fibroid polyp near one cornu", 'role': 'assistant'}]