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: Gynaecology & Obstetrics
Which of the following decrease sex hormone binding globulin 
Select and explain. 
A. Oral contraceptive pills, B. Insulin, C. Thyroxine Hormone, D. Pregnancy
B: Insulin
Answer: B: Insulin 
Explanation: None