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
A region is divided into 50 villages for the purpose of a survey. 10 villages are then selected randomly for the purpose of a study. This type of sampling is termed as - 
Select and explain. 
A. Simple Random sampling, B. Stratified sampling, C. Cluster Sampling, D. Systematic Sampling
C: Cluster Sampling
Answer: C: Cluster Sampling 
Explanation: None