This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Random sampling is not done in? 
Select and explain. 
A. Cluster sampling, B. Quota sampling, C. Stratified sampling, D. Simple random
B: Quota sampling
Answer: B: Quota sampling 
Explanation: Quota sampling is a method for selecting survey paicipants that is a non-probabilistic version of stratified sampling. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 913