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
For an epidemiological study, every 10th person is selected from a population. This type of sampling is known as: 
Select and explain. 
A. Simple random sampling, B. Statified random sampling, C. Systemic random sampling, D. Cluster random sampling
C: Systemic random sampling
Answer: C: Systemic random sampling 
Explanation: None