Final answer:
The medication that should be stopped if a patient suddenly cannot hear is streptomycin, due to its known ototoxic effects which can lead to hearing loss. While Lasix can also cause ototoxicity in rare cases, it is less likely than streptomycin to be the cause. Morphine does not typically cause hearing loss.
Step-by-step explanation:
If a person who has been prescribed Lasix, streptomycin, and morphine suddenly cannot hear, it is likely due to an adverse effect of one of the medications. Among the listed drugs, streptomycin, an aminoglycoside antibiotic, is known to have ototoxic effects, which can cause damage to the ears. Ototoxicity can lead to temporary or even permanent hearing loss. Therefore, if a patient experiences a sudden loss of hearing, streptomycin should be considered as the potential cause and its use should be re-evaluated.
Morphine is an opioid used for pain relief and has not been commonly associated with hearing loss. Lasix (furosemide) is a diuretic that can cause a rapid decline in electrolyte levels and, in rare circumstances, may contribute to ototoxicity, but it is less likely than streptomycin to cause hearing loss. In a clinical situation where a patient presents with sudden hearing loss, the healthcare provider would typically stop streptomycin administration and assess the patient's hearing.