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
[{'content': "Which is not a feature of Edwards' syndrome? \nSelect and explain. \nA. Mental retardation, B. Stunting of growth, C. Hypotonia, D. Congenital disease", 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]