80. Which of the following medications is an antibiotic?

Answer: A

Explanation:

Daptomycin is an antibiotic.

Daptomycin is classified as an antibiotic medication that is used primarily to treat bacterial infections. It works by disrupting bacterial cell membrane function, making it effective against certain types of Gram-positive bacteria.

A) Daptomycin

Daptomycin is an antibiotic used to treat serious bacterial infections, particularly those caused by resistant Gram-positive organisms. Its mechanism involves binding to the bacterial cell membrane, which leads to depolarization and ultimately cell death, confirming its role as an antibiotic.

B) Acyclovir

Acyclovir is an antiviral medication used primarily to treat infections caused by certain types of viruses, including herpes simplex virus and varicella-zoster virus. It is not effective against bacterial infections, thus it does not qualify as an antibiotic.

C) Oxytocin

Oxytocin is a hormone that is used medically to induce labor and control bleeding after childbirth. It does not have any antibacterial properties and is not classified as an antibiotic.

D) Phenazopyridine

Phenazopyridine is a medication that provides relief from urinary tract discomfort, such as pain and burning. It acts as a urinary analgesic and does not possess antibiotic properties, making it unsuitable for treating bacterial infections.

Conclusion

Daptomycin is definitively the correct answer as it is an antibiotic designed to combat bacterial infections, while the other options—Acyclovir, Oxytocin, and Phenazopyridine—serve entirely different medical purposes and do not exhibit antibacterial activity. Thus, they do not fulfill the requirement of being classified as antibiotics.