This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sampling, Subject name: Social & Preventive Medicine
[{'content': 'In Random sampling, the probability of selecting an item from the population is:- \nSelect and explain. \nA. Not Known, B. Known, C. Undecided, D. Zero', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Probability sampling - Samples selected through probability sampling are also frequently known as random samples . Randomness, however, does not imply that the sample units are selected haphazardly. On the contrary, in this method of sampling, the probabilities for selecting the different samples from a population are specified, and the probabilities for the units of the population to appear in the samples are known.', 'role': 'assistant'}]