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
Which of the following is not an intracellular enzyme? 
Select and explain. 
A. Enzymes of oxidative phosphorylation, B. Salivary amylase, C. Glycogen synthase, D. None of the above
B: Salivary amylase
Answer: B: Salivary amylase 
Explanation: Intracellular enzymes:
Cytoplasm: Enzymes of glycolysis (conversion of glucose and glycogen to pyruvic and lactic acid).
Mitochondria: Enzymes of citric acid cycle and oxidative phosphorylation.
Lysosomes: Hydrolytic enzymes.