This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Which one of the following is a distinguishing feature of Edward's syndrome 
Select and explain. 
A. Hypotonia, B. Hypotelorism, C. Holoprosencephaly, D. Rocker bottom feet
D: Rocker bottom feet
Answer: D: Rocker bottom feet 
Explanation: Rocker bottom foot, also known as congenital vertical talus, is an anomaly of the foot.
It is characterized by a prominent calcaneus (heel bone) and a convex rounded bottom of the foot.
It gets its name from the foot's resemblance to the bottom of a rocking chair.