Penicillin Is A(n)

Penicillin is a(n)

A) β-lactam antibiotic and has a low therapeutic index, meaning that it is of high toxicity to the host.
B) carbapenam and is thus resistant to extended spectrum β-lactamases.
C) glycopeptide antibiotic and is thus used as an antibiotic of last resort.
D) β-lactam antibiotic and has a high therapeutic index, meaning that it is of low toxicity to the host.
E) aminoglycoside and may sometimes cause kidney damage.