An enzyme involved in the catabolism of fructose to pyruvate in the liver is: (A) Glyceraldehyde–3–phosphate dehydrogenase, (B) Phosphoglucomutase, (C) Lactate-dehydrogenase, (D) Glucokinase
Answer is A. Glyceraldehyde-3-phosphate dehydrogenase 

Fructose is converted glyceroldehyde-3-phosphate which, in turn, is metabolised to pyruvate by glycolysis.
Amongst the given options, only glyceraldehyde-3-phosphate dehydrogenase is the enzyme which is involved in glycolysis after formation of glyceraldehyde-3-phosphate dehydrogenase.