<prompt> A child is suffering from dry skin and is mentally retarded-diagnosis -Vit A deficiencyCrebral palsyHypothyroidismAll above  <response>: Ans. is c i.e., Hypothyroidism.o Vit A deficiency causes oculor symptom.The different eye signs of vitamin A deficiency VAD in children, as graded by the WHO, are: Night blindness XN Conjunctival xerosis XIA Bitots spots X1B Corneal xerosis X2 Corneal ulcer covering less than 13 of the cornea X3A Corneal ulcer covering at least 13 of the cornea, defined as keratomalacia X3B Corneal scarring XS skin dryness-X-erodermao Cerebral palsy causes mental retardetion but No skin dryness.o Hypothyroidism causes mental reterdetion along with skin dryness and other features.Clinical feature of hypothyroidismCongenitalAcquired1 Open posterior fontanelle2 Umbilical hernia3 Edematous faces4 Constipation5 Pallor6 Hypothermia7 Large tongue8 Rough skin9 Hypotonia10 Large abdomen1 Growth retardation2 Delayed dentition3 Delayed puberty4 Myopathy5 Pseudotumor cerebri 