This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': "Average Mental IQ according to Wechsler's Scale is – \nSelect and explain. \nA. 70–79, B. 80–89, C. 90–109, D. 110–119", 'role': 'user'}, {'content': "Answer: C \nExplanation: Wechsler Adult Intelligence Scale (WAIS) : David Wechsler (1939), published the first intelligence test designed for an adult population; It was the first IQ test based on Normal/Gaussian distribution'.\nIt is currently in its fourth edition (WAIS-IV). The original WAIS (Form I) was published in February 1955, as a revision of the Wechsler - Bellevue intelligence scale that had been released in 1939. Fourth edition (WAIS-IV) was released in 2008 by Pearson.\nThe median full scale IQ is Centered at 100, with a standard deviation of 15. In a normal distribution, the IQ range of one SD above and below the mean (i.e. 85 and 115) is where approximately 68% of all adult would fall.", 'role': 'assistant'}]