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
Which of the following is not used to induce ovulation- 
Select and explain. 
A. Danazol, B. Clomiphene, C. HMG, D. HCG
A: Danazol
Answer: A: Danazol 
Explanation: None