Achinchilla is in need of an antibiotic to treat a bacterial infectious disease. what antibiotic should be avoided in this species?

Broad spectrum antibiotics (Enrofloxacin and ciprofloxacin).

Explanation:

Chinchilla is a rodent and herbivorous mammal very sensitive to antibiotics. This is because its intestinal flora is composed of bacteria (Gram +, anaerobic and gram -) that help in the digestion of cellulose (carbohydrates abundant in vegetables) and form a protective barrier against harmful bacteria. Flora bacteria are very sensitive to antibiotics and, when eliminated, favor the growth of harmful bacteria such as Clostridium and Escherichia coli. For this reason, the use of antibiotics can cause poisoning. Because of this, broad-spectrum antibiotics should be avoided (Example: Enrofloxacin and ciprofloxacin), that is, antibiotics that do not discriminate between good and harmful bacteria. Or those that attack anaerobic bacteria (Example: metronidazole), since most of the bacteria of the intestinal flora are.

i think that c)gold was found there

but i am not sure