This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics And Genetic Disorders, Subject name: Pediatrics
Which of the following feature is not seen in Prader Willi syndrome? 
Select and explain. 
A. Obesity, B. Mental retardation, C. Ataxia, D. Hypotonia
C: Ataxia
Answer: C: Ataxia 
Explanation: Ans. is 'c' i.e., Ataxia Prader willi syndrome* It is due to paternal genomic imprinting in which there is deletion on paternal chromosome 15.* They are characterized by hypotonia, obesity, short stature, mental retardation, hypogonadism, hyperphagia, and short hand and feet.* There is decrease in GnRH, LH, FSH and GH. Ghrelin levels are raised.