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: Pathology
[{'content': 'Which of the following is a non-modifiable risk factor for CHD ? \nSelect and explain. \nA. Diabetes, B. Smoking, C. Hypeension, D. Old age', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Old age Old age is a non-modifiable risk factor for atherosclerosis and coronary hea disease (CHD). Other three (given in question) are modifiable risk factors.", 'role': 'assistant'}]