Final answer:
The coenzyme required in the reaction catalyzed by β-hydroxy acyl CoA dehydrogenase is NAD+.
Step-by-step explanation:
The coenzyme required in the reaction catalyzed by β-hydroxy acyl CoA dehydrogenase is NAD+.
β-hydroxy acyl CoA dehydrogenase is an enzyme involved in the β-oxidation of fatty acids. It catalyzes the dehydrogenation of β-hydroxy acyl CoA, which forms a β-keto acyl CoA. In this process, NAD+ acts as a coenzyme, accepting hydrogen atoms from the substrate to form NADH.
Other coenzymes mentioned in the options you provided, such as Coenzyme A (CoA), Flavin adenine dinucleotide (FAD), and Nicotinamide adenine dinucleotide (NAD+), are involved in different steps of fatty acid metabolism, but specifically for the reaction catalyzed by β-hydroxy acyl CoA dehydrogenase, NAD+ is required.