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
Deficiency of enzyme in Tay–Sack disease – 
Select and explain. 
A. Galactosidase, B. Hexosaminidase, C. Acid lipase, D. Glucosidase
B: Hexosaminidase
Answer: B: Hexosaminidase 
Explanation: None