<prompt> The first step in fatty acid synthesis involvesAcetyl CoA carboxylaseb-Hydroxyl CoA dehydrogenaseAcetyl dehydrogenasePyruvate kinase  <response>: Acetyl CoA carboxylase Production of malonyl-CoA from acetyl-CoA is the initial and rate limiting step in fatty acid synthesis. The reaction is catalyzed by acetyl-CoA carboxylase. 