This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Which is not a feature of Edwards' syndrome? 
Select and explain. 
A. Mental retardation, B. Stunting of growth, C. Hypotonia, D. Congenital disease
C: Hypotonia
Answer: C: Hypotonia 
Explanation: Edwards' syndrome (trisomy 18) 47,XY,+18 or 47,XX,+18 Early lethality, characteristic skull and facies, frequent malformations of hea, kidney and other organs Ref - Davidson 23e pg 44