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
The most reliable bones for the purpose of medullary index are the following except : 
Select and explain. 
A. Humers, B. Tibia, C. Radius, D. Sternum
D: Sternum
Answer: D: Sternum 
Explanation: D i.e. Sternum Sex can be determined most reliably by medullary index of tibia, humerus, ulna and radiusQ