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
Leisch nyhan syndrome due to? 
Select and explain. 
A. HGP ase deficieny (complete), B. HGP ase deficiency (paial), C. Hexosaminidase deficiency (complete), D. Hexosaminidase deficiency (paial)
A: HGP ase deficieny (complete)
Answer: A: HGP ase deficieny (complete) 
Explanation: Ans. is 'a' i.e., HGPase deficiency (complete)