This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant Genetic Syndromes, Subject name: Pediatrics
Not seen in William syndrome? 
Select and explain. 
A. Elfin facies, B. Subvalvular aoic stenosis, C. Hypercalcemia, D. Hypeension
B: Subvalvular aoic stenosis
Answer: B: Subvalvular aoic stenosis 
Explanation: William's syndrome- Supravalvular aoic stenosis Intellectual disability Sho stature Hypercalcemia and hypeension Face of a child with 'elfin facies' -small upturned nose, long philtrum, wide mouth, full cheeks, full lips, small chin, and puffiness around the eyes.