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': 'For a survey a village is divided into 5 lanes then each lane is sapled randomly is an example is - \nSelect and explain. \nA. Simple random sampling, B. Stratified random sampling, C. Systematic random sampling, D. All of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: - systematic random sample is done by picking every 5th or 10th unit at regular intervals. - by this method ,each unit in the sampling frame would have the sane chance of being selected, but the number of possible samples is greatly reduced. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:850", 'role': 'assistant'}]