<prompt> Which of the following disease modifying anti- rheumatoid drugs is a prodrug?EtanerceptNimesulideSulfasalazineColchicine  <response>: - Sulfasalazine is a pro-drug. - It dissociates in the colon to produce 5-ASA MESELAMINE and sulfapyridine. - 5-ASA is the active moiety in treatment of ulcerative colitis whereas sulfapyridine is used to treat rheumatoid ahritis. 