Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?

Acetyl CoA is the common metabolite that arise from respiratory breakdown of carbohydrates, Lipid (fats) & Proteins. Fructose-6-Phosphate & Glucose – 6 – phosphate doesnot arise from Fats & Proteins.  Pyruvic acid may or may not arise from Fats & Proteins.