This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Identification, Subject name: Forensic Medicine
[{'content': 'Sex can be determined by all except - \nSelect and explain. \nA. Preauricular sulcus, B. Innominate bone, C. Pelvic brim, D. Coccyx', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pelvic brim is more spacious and circular in females, coccyx is more movable and preauricular sulcus is more frequent and broad and deep in females. In males, pelvic brim is hea shaped, preauricular sulcus is narrow and coccyx is less movable. ref : Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27th edition pg. 32.', 'role': 'assistant'}]