Proofreading. Clean up the following sentences by identifying and correcting misspellings and misused/incorrect words.

QUESTION:
1.Urolithiasis is another name for one of the following: uretral stone, kidney stone, or renil stone. Medical word building knowlege teaches that this is a renil stone.

ANSWER:

Urolithiasis is another name for one of the following: ureteral stone, kidney stone, or renal stone. Medical word building knowledge teaches that this is a renal stone.

* changed spelling to correct it -
ureteral
renal, knowledge

? knowledge teaches 'that this 'is a
is this ok?

Yes, that phrasing is fine as long as it's crystal clear what the pronoun "this" is referring to. In these sentences, the pronoun is referring to "urolithiasis," correct?