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
Hyperammonemia type-1 is due to deficiency of 
Select and explain. 
A. Arginase, B. Arginosuccinate lyase, C. Arginosuccinate synthase, D. CPS-1
D: CPS-1
Answer: D: CPS-1 
Explanation: Ans. is 'd' i.e., CPS-1 Disorders caused by genetic defects of urea cycle enzymesHyperammonemia type-I Hyperammonemia type-II Citrullinemia Argininosuccinic aciduria Argi ninemiaDefective enzymeCarbamoyl phosphate synthase-I Ornithine transcarbamoylase Argininosuccinate synthase Argininosuccinate lyase ArginaseProducts accumulatedAmmonia Ammonia Citrulline Argininosuccinate Arginine.