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
Which of the following is/are non random sampling methods- 
Select and explain. 
A. Quota sampling, B. Stratified random sampling, C. Convenience sampling, D. Cluster sampling
A: Quota sampling
Answer: A: Quota sampling 
Explanation: <p> Quota sampling is non-random sampling. Reference: Simple Biostatistics by Indeayan & Indrayan,1st edition,pg no:35-36 and Methods in Biostatistics by Mahajan,7 th edition,pg no:91. <\p>