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 statements about "Simple Randam sampling" is true- \nSelect and explain. \nA. Every element in the population has an equal probability of being included, B. Sampling is based on similar characteristics, C. Suitable for large heterogenous population, D. Complete list of items within the sampling frame is not required', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]