<prompt> Mechanism of action of propylthiouracilin hypehyroidism is:Inhibition of organification of iodineInhibition of oxidation of iodineInhibition of coupling of two DIT residuesAll of the above  <response>: Ref: KDT 6e p248 Propylthiouracil, carbimazole and methimazole act by inhibiting the enzyme, thyroid peroxidase. It catalyses: Oxidation of iodine Organification Coupling 