***WHAT vs. WHICH*** number or infinite possibilities for an answer.
WHAT is used to ask when there are an unknown
What is your favorite color? -- The answer could be anything. The question does not specify any options.
WHICH is used if you are are choosing between a more limited number of items, already defined.
Which color do you like, blue or green? -- The answer to this could be only blue or green, the options are already specified.
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