What is the question "What does pH stand for ?" asking about?

OPTIONS:
- description
- entity
- abbreviation
- human
- numeric
- location
A: abbreviation

What is the question "What are the words to the song sung by `` Banana in Pajamas '' ?" asking about?

OPTIONS:
- description
- entity
- abbreviation
- human
- numeric
- location
A: description

What is the question "What are the limits to `` self-defense ? ''" asking about?

OPTIONS:
- description
- entity
- abbreviation
- human
- numeric
- location
A: description

What is the question "Who developed the first polio vaccine ?" asking about?

OPTIONS:
- description
- entity
- abbreviation
- human
- numeric
- location
A:
human