Question: The student wanted to impress with his essay and looked up a synonym for standard, he found a word that had a slant rhyme with "proverbial" and was quite proud, what did he find?

Choices: 
- informal
- stanine
- basic
- nonstandard
- colloquial

The rationale to choose "colloquial" as the answer is that: 

this is generally found in slang and colloquial language