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: 50cm how many mm ?
What it means to have hazel eyes ?
What is the value of a 1969 US 5 cent coin ?
What do eclogists study ?
A:
What is the value of a 1969 US 5 cent coin ?