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
The commonest cause of pathological fracture is generalized affection is: 
Select and explain. 
A. Carcinoma, B. Osteoporosis, C. Cyst, D. All of the above
B: Osteoporosis
Answer: B: Osteoporosis 
Explanation: B i.e. Ostoporosis