.

14 153. Which of the following statements are correct? (i) Drugs that mimic natural messenger by switching on the receptor are called agonists. (ii) Shape of the receptor does not change after attachment of chemical messenger. (iii) A cationic detergent is formed when stearic acid reacts with polyethylene glycol. (iv) Seldane is an antihistamine (a) (ii), (iii) (b) (i), (iii), (iv) (c) (i), (iv) (d) (i), (ii), (iii)