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 formula for '' cobalt chloride hexahydrate '' ?
What did the ladies wear in the 60 's ?
What is mars 's distinguishing color ?
What is the sentence for the word adherent ?
A:
What did the ladies wear in the 60 's ?