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
[{'content': 'Leisch nyhan syndrome due to? \nSelect and explain. \nA. HGP ase deficieny (complete), B. HGP ase deficiency (paial), C. Hexosaminidase deficiency (complete), D. Hexosaminidase deficiency (paial)', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., HGPase deficiency (complete)", 'role': 'assistant'}]