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: Pharmacology
Which drug causes osteoporosis on long-term use 
Select and explain. 
A. Estrogen, B. Progesterone, C. GnRH analogues, D. Warfarin
C: GnRH analogues
Answer: C: GnRH analogues 
Explanation: Ans. is 'c' i.e., GnRH analogues Drugs causing osteoporosis : o Glucocoicoids o Cytotoxic drugs o Excessive alcohol intake o Excessive thyroxine o Heparin o Cyclosporine o Anticonvulsants o Aluminum o GnRH agonist o Lithium