Given the task definition and input, reply with output. 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.

What are the main structure of an eye ?
What isotope of hydrogen has one neutron ?
Richest in complex carbohydrates ?
Things about castles in wales ?
What isotope of hydrogen has one neutron ?