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': 'A patient with M of 4 yrs duration presents with dizziness and HR 52/min, probable cause isa) Hypoglycaemiab) Inferior wall MIc) Sick-sinus syndromed) Autonomic dysfunction \nSelect and explain. \nA. bcd, B. acd, C. ac, D. bd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]