This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
Uronic acid pathway is not involved in: 
Select and explain. 
A. Conjugation of bilirubin, B. GAG synthesis, C. Vitamin C synthesis, D. Biotransformation
C: Vitamin C synthesis
Answer: C: Vitamin C synthesis 
Explanation: Ans. C. Vitamin C synthesis(Ref: Harper 31/e page 186)Glucuronic acid is involved in the conjugation of Bilirubin.Uronic acid and amino sugar are the repeating disaccharide unit in the glycosamino glycans.Glucuronidation is a Phase II Xenobiotic reactions (Biotransformation)Uronic acid pathway cannot synthesize vitamin C in humans and higher primates because of lack of L-Gulano lactone oxidase