This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Infantile propoion in adult is seen in 
Select and explain. 
A. Morquio's disease, B. Achondroplasia, C. Hypothyroidism, D. Malnutrition
B: Achondroplasia
Answer: B: Achondroplasia 
Explanation: Normal body propoion in adults Height = arm span Upper segment= lower segment Normal body propoion in infants is Height ( length)> arm span Upper segment> Lower segment. Infantile propoion means increased upper to lower segment ratio. Seen in conditions like Achondroplasia and hypothyroidism. Reverse infantile propoion means increased lower segment. Seen in Eunuchoidism, Marfans syndrome, Homocystinuria, Klinefelter's syndrome. Ref: Nelson's 20th edition, Pg- 3371.