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
[{'content': 'Which of the following decrease sex hormone binding globulin \nSelect and explain. \nA. Oral contraceptive pills, B. Insulin, C. Thyroxine Hormone, D. Pregnancy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]