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: Forensic Medicine
[{'content': 'Whole skull is used to calculate: PGI 12 \nSelect and explain. \nA. Cephalic index, B. Nasal index, C. Crural index, D. Brachial index', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Cephalic index', 'role': 'assistant'}]