Question

look at the text below. if there is an error with subject - verb agreement, select the incorrect verb and type it correctly. otherwise, submit the text without making any changes.
\this medication is available in both capsule and tablet form, and either prove effective in alleviating your symptoms,\ dr. yamada told andy.

Explanation:

The subject "either" (referring to either the capsule or tablet form of the medication) is a singular subject. In subject - verb agreement, a singular subject takes a singular verb. The verb "prove" is incorrect here; it should be "proves" to agree with the singular subject "either".

Answer:

"This medication is available in both capsule and tablet form, and either proves effective in alleviating your symptoms," Dr. Yamada told Andy.