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': '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 - \nSelect and explain. \nA. Simple Random sampling, B. Stratified sampling, C. Cluster Sampling, D. Systematic Sampling', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]