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: Social & Preventive Medicine
[{'content': 'The commonest cause of death in the sophisticated world - \nSelect and explain. \nA. Ischemic heart disease, B. Accidents, C. Infectious disease, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Coronary heart disease (Ischemic heart disease) \n\nCHD is defined as "impairment of heart function due to inadequate blood flow to the heart compared to its needs, caused by obstructive changes in the coronary circulation to the heart".\nIt is the most common cause of death in developed countries and account for 25-30% of deaths.\nCHD is modern epidemic, i.e. a disease that affects populations, not an unavoidable attribute of ageing.', 'role': 'assistant'}]