Explanation

Gentamicin is an aminoglycoside antibiotic that is well-known for its ototoxic effects

Potentially causing damage to the inner ear and leading to hearing loss or balance issues.

The other drugs listed are not typically associated with ototoxicity:

1. Contimycin: This appears to be a less commonly used or less well-known drug; assuming it refers to an antibioticIt is not generally recognized for ototoxicity.
2. Amoxicillin: This is a penicillin-type antibiotic and is not known to be ototoxic.
3. Erythromycin: This is a macrolide antibiotic and, it is not typically ototoxic.
4. Penicillin: This class of antibiotics is not associated with ototoxicity.