This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Liver), Subject name: Surgery
Which is not elevated in a child presenting with jaundice, icterus, pruritus & clay coloured stools. 
Select and explain. 
A. Gamma glutanyl transpeptidase, B. Alkaline phosphatase, C. 5'-nucleotidase, D. Glutamate dehydrogenase
D: Glutamate dehydrogenase
Answer: D: Glutamate dehydrogenase 
Explanation: Ans. is 'd' i.e. Glutamate dehydrogenase Jaundice, icterus, clay coloured stools, pruritus, all suggest cholestatic jaundiceThese three enzymes are usually elevated in cholestasis 1. Alkaline phosphatase 5'-nucleotidaseGamma glutamyl transpeptidase