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': 'Non-modifiable risk factor for hypertension \nSelect and explain. \nA. Gender, B. Obesity, C. Salt intake, D. Cultural characteristic acquired over time', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]