FDA approval in world's most expensive drug

International Desk:
The Federal Drug Administration (FDA) in the United States has recognized the world's most expensive drug.This drug is called ‘Hemgenix'.The drug costs US$3.5 million (Rs 28.51 crore) per dose.This drug is used to treat the very rare disease 'Hemophilia B.'Hemophilia B is a hereditary disease in which a person's blood begins to clot less.