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
Whole skull is used to calculate: PGI 12 
Select and explain. 
A. Cephalic index, B. Nasal index, C. Crural index, D. Brachial index
A: Cephalic index
Answer: A: Cephalic index 
Explanation: Ans. Cephalic index