IQ for sever mental retardation -: (A) <20, (B) 20-35, (C) 35-50, (D) 50-70
Answer is B. WHO classification of Mental retardation(MR) mild MR...IQ 50-70 moderate MR ...35-49 severe MR..IQ 20-34 profound MR...IQ under 20 ref; (page no;582) 23rd edition of PARK&;s textbook of Preventive and Social medicine