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: Surgery
Most common cause of interochanteric fracture in old is - 
Select and explain. 
A. Osteoporosis, B. Paget's dis, C. Osteopetrosis, D. Osteomalacia
A: Osteoporosis
Answer: A: Osteoporosis 
Explanation: Answer- A. OsteoporosisHaving osteoporosisHaving a history of other bone problems or fracturesHaving low bone density and low muscle mass