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: Biochemistry
The enzyme deficient is Lesch-Nyhan syndrome is: 
Select and explain. 
A. GT, B. Glutaminase, C. Transcarboxylase, D. HGP
D: HGP
Answer: D: HGP 
Explanation: D i.e. HGP