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
[{'content': 'In a sampling technique, every 10th unit of population is chosen. What is this type of sampling technique called? \nSelect and explain. \nA. Systematic random sampling, B. Systematic sampling, C. Simple random sampling, D. Cluster sampling', 'role': 'user'}, {'content': "Answer: A \nExplanation: Systematic random sampling is a sampling technique. It is done by picking up every 5th or 10th unit at regular intervals. By this method, each in the sampling frame would have the same chance of being selected, but the number of possible samples is reduced. Other sampling methods are simple random sampling, stratified random sampling. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 913", 'role': 'assistant'}]