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': 'For an epidemiological study, every 10th person is selected from a population. This type of sampling is known as \nSelect and explain. \nA. Simple random sampling, B. Systematic random sampling, C. Stratified random sampling, D. Cluster random sampling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]