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: Medicine
In osteoporosis there is -a) Decrease in absolute amount of bone massb) More common in malec) Radiographs show normal bone densityd) Hormonal replacement therapy 
Select and explain. 
A. ad, B. c, C. ac, D. ab
A: ad
Answer: A: ad 
Explanation: None