True about orphan drug is ?

Ans. is 'a' i.e., Prevention of rare disease or condition Orphan drug Drugs or biological products for diagnosis/ treatment/ prevention of a rare disease or condition or a more common disease (endemic only in resource poor countries), for which there is no reasonable expectation that the cost of developing and marketing it will be recovered from the sales of that drug. Sodium nitrite, fomepizole, liposomal amphotericin B, miltefosine, rifabutin, succimer, somatropin, digoxin immune Fab, liothronine are some of the orphan drugs. Governments in developed countries provides tax benefits and other incentives to pharmaceutical companies for developing and marketing orphan drugs.