This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abnormalities of Development, Subject name: Pediatrics
[{'content': 'A male child of 15 years with a mental age of 9 years has an IQ of: \nSelect and explain. \nA. 50, B. 60, C. 70, D. 80', 'role': 'user'}, {'content': 'Answer: B \nExplanation: IQ = Mental age x 100/Chronological age =So, in this case, IQ = 9 x 100/15 = 60 Degree IQ level Mild 51-70 Moderate 36-50 Severe 21-35 Profound 0-20', 'role': 'assistant'}]