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
[{'content': 'Renin plays important role in - \nSelect and explain. \nA. Renovascular hypertension, B. Malignant hypertension, C. Coronary artery disease, D. Essential hypertension', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]