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: Pediatrics
10 year old child with mental age of 2 years will have an IQ level of: September 2010, March 2013 (h) 
Select and explain. 
A. 20, B. 30, C. 50, D. 70
A: 20
Answer: A: 20 
Explanation: Ans. A: 20 The formula for calculating IQ developed by Terman was 100 x MA / CA. Chronological Age (CA) (i.e. Biological age) Mental Age (MA) (i.e. Level of intellectual performance)