<prompt> True regarding tetanus toxoid isare -Plain toxoid have long durationAbsorbed toxoid are more beneficialShould never freezeStored at 0 oC  <response>: Absorbedpurified tetanus toxoid has largely supplemented plain toxoid because it stimulates a higher and long lasting immunity response than plain toxoid. Reference:Park;s textbook of preventive and social medicine,K.Park,23rd edition,page no:312. p 