## **Core Concept**
The question tests knowledge on the side effects of aminoglycoside antibiotics, specifically their potential to cause ototoxicity. Aminoglycosides are a class of antibiotics known for their efficacy against certain types of bacterial infections, but they can have serious side effects, including nephrotoxicity and ototoxicity. Ototoxicity can manifest as either vestibular (balance) toxicity or cochlear (hearing) toxicity.

## **Why the Correct Answer is Right**
Streptomycin is notably associated with a high risk of ototoxicity, particularly vestibular ototoxicity. It works by interfering with the bacterial ribosome, but its use in humans can lead to damage to the inner ear structures. The vestibulotoxic effects of streptomycin can cause significant balance problems. Among the aminoglycosides, streptomycin and gentamicin are particularly known for their ototoxic potential, but streptomycin has a distinctive vestibular toxicity profile.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While gentamicin is indeed ototoxic, with a risk that affects both vestibular function and hearing, it is not considered to have the highest risk compared to streptomycin in terms of vestibular toxicity.
- **Option B:** Tobramycin has a lower risk of ototoxicity compared to gentamicin and streptomycin but can still cause it, particularly at higher doses or with prolonged use.
- **Option D:** Amikacin has a notable risk of nephrotoxicity and can cause ototoxicity, but it is generally considered to have a lower risk of ototoxicity compared to streptomycin.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that streptomycin's use is limited due to its ototoxicity, and it is primarily reserved for treating certain infections like tuberculosis and plague, where its benefits outweigh the risks. Monitoring for signs of ototoxicity, such as tinnitus, hearing loss, or balance problems, is crucial when using aminoglycosides.

## **Correct Answer:** . Streptomycin