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': 'TRUE about simple random sampling is: \nSelect and explain. \nA. All person have equal right to be selected, B. Only selected person have right to be selected, C. Technique provides least number of possible samples, D. Every fixed unit is taken for sampling.', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. All person have equal right to be selected In simple random sampling, the sample is drawn in such a way that each unit has an equal chance of being drawn in the sample.", 'role': 'assistant'}]