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': 'Sinus bradycardia is seen in: \nSelect and explain. \nA. Athletes, B. Exercise, C. Thyrotoxicosis, D. Beta adrenoceptor agonist', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sinus tachycardia is associated with a sinus rate of more than 100/min. The various causes are,\n\nAnxiety\nFever\nExercise\nEmotion\nAnaemia\nThyrotoxicosis\nBeta adrenoceptor agonists\n\nSinus bradycardia is\xa0associated with a sinus rate of less than 60/min and is seen commonly in athletes.\n\nMyocardial infarction\nHypothyroidism\nCholestatic jaundice\nRaised intracranial pressure\nBeta-blockers\nDigoxin\nVerapamil', 'role': 'assistant'}]