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: Dental
[{'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. Statified random sampling, C. Systemic random sampling, D. Cluster random sampling', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]