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 tachycardia is seen in \nSelect and explain. \nA. Beta blocker therapy, B. Athletes, C. Hypothyroidism, D. Severe anaemia', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]