For each of the following questions, pick the most appropriate answer of those provided:
1) Hyperammonemia is caused by lack of which of the following enzymes?
a) Ornithine Carbamoyltransferase (OCT) b) GLDH
c) Alkaline Phosphatase (ALP) d) Alanine Transaminase (ALT)
2) Total cholesterol assay is based on which of the following methods?