What is the generic name of Macrobid?

A. Niacin is the generic name for nicotinic acid or vitamin B3, used as an antilipemic agent. It inhibits the peripheral mobilization of free fatty acids to reduce hepatic triglyceride synthesis. It is not the active antimicrobial component of Macrobid. B. Cephamycin represents a specific subclass of beta-lactam antibiotics, such as cefoxitin, derived from Streptomyces species. These agents possess a methoxy group at the 7-alpha position of the cephem nucleus. This classification does not correspond to the brand Macrobid. C. Cetirizine is a second-generation H1-receptor antagonist used for the treatment of allergic rhinitis. It works by selectively inhibiting peripheral histamine receptors to reduce inflammatory symptoms. It lacks the antibacterial properties required for the treatment of urinary infections. D. Nitrofurantoin is the generic name for Macrobid, a nitrofuran antibiotic used for cystitis. It is reduced by bacterial flavoproteins to reactive intermediates that damage ribosomal proteins and DNA. The Macrobid formulation specifically contains both macrocrystals and monohydrate forms.