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': 'Which of the following is/are non random sampling methods- \nSelect and explain. \nA. Quota sampling, B. Stratified random sampling, C. Convenience sampling, D. Cluster sampling', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <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>', 'role': 'assistant'}]