This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': "In Muller's maneuver to predict cephalopelvic disproportion (CPD) \nSelect and explain. \nA. The vaginal finger is at ischial spine, B. The vaginal finger is at sacral promontory and thumb at the pubic symphysis, C. The vaginal finger is at tip of sacrum, D. None of the above", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a (The vaginal finger is at ischial spine) (Ref. Dutta Obst 6th/353)Muller introduced the abdominovaginal method of diagnosing CPD at the brim by placing the vaginal finger at the level of ischial spine to note the descent of the fetal head.Munro-Kerr added placement of the thumb over the synmphysis pubis to note the degree of overlapping.', 'role': 'assistant'}]