Where do fatty acids enter the respiratory pathway?

Common molecule formed from all food stuffs during aerobic respiration is

Before entering the respiratory pathway,amino acids are:

$A$: The tricarboxylic acid $(TCA)$ cycle is an amphibolic pathway.
$R$: $A$ number of $TCA$ cycle intermediates are used in various catabolic reactions only.

Read the following statements and choose the correct option:

To enter into the respiratory pathway,protein molecules must be converted into: