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]: What is planet Earths best known feature ?
Who discovered fluoride ?
What is the most hardest division problem in the world ?
2 types of business communications enhanced by desktop publishing are ?
[A]: Who discovered fluoride ?

[Q]: How can you tell am pregent ?
How did cristoper columbus die ?
Otto hahn contribution to the atom ?
What is the value of a 1985 porcelain cabbage patch kid doll with birth certificate and box still in plastic ?
[A]: What is the value of a 1985 porcelain cabbage patch kid doll with birth certificate and box still in plastic ?

[Q]: What compound is regenerated in each turn of the citric acid cycle ?
How can you work online to get money easy ?
Who invented diseal engine ?
How do websites use cookies you nead a real awnser ?
[A]:
What compound is regenerated in each turn of the citric acid cycle ?