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
[{'content': 'Thromboembolism is due to which component of OCP \nSelect and explain. \nA. Progesterone, B. Estrogen, C. Iron, D. FSH', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Estrogen o Estrogen is responsible for venous thromboembolism, i.e. leg vein and pulmonary thrombosis. o Both estrogen and progesterone are responsible for aerial phenomena, i.e. coronary, and cerebral thrombosis ---> MI and stroke", 'role': 'assistant'}]