This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': '&;Design Effect&; is assiciated with which of the following sampling techniques- \nSelect and explain. \nA. Stratified sampling, B. Systemic sampling, C. Cluster sampling, D. Simple Random sampling', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]