Detailed Instructions: You are given a list of queries separated by new line. Your job is to answer with the query that is the most well-formed or well-structured query in terms of grammar, punctuations, or spelling errors.
Q: The name for a young duck ?
How much do rheumatologist 's make ?
The meaning of air pollution ?
What is an example of tonicity ?
A:
What is an example of tonicity ?