This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Pharmacology, Subject name: Pharmacology
Drugs or biological products for diagnosis, treatment or prevention of a rare disease or condition are called- 
Select and explain. 
A. Orphan drugs, B. Rare drugs, C. Extinct drugs, D. Essential drugs
A: Orphan drugs
Answer: A: Orphan drugs 
Explanation: Ans. is 'a' i.e., Orphan drugs Orphan drugso These are drugs or biological products for diagnosis/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 wall be recovered from the sales of that drug,o The list includes sodium nitrite, fomepizole, liposomal amphotericin B, miltefosine, rifabutin, succimer, somatropin, digoxin immune Fab (digoxin antibody), liothyronine (T3) and many more,o Though these drugs may be life saving for some patients, they are commercially difficult to obtain as a medicinal product.o Government in developed countries offer tax benefits and other incentives to pharmaceutical companies for developing and marketing orphan drugs (e.g. Orphan Drug Act in USA).