
Which
Choice Clarification
Use 'which' to clarify a choice from a limited set of options.

There are several colors available, which do you prefer?
Question Precision
When asking questions, 'which' helps to show you're expecting specific information as an answer.

Which of these dishes is the spiciest?
Not 'What'
'Which' implies a choice among a specific group, unlike the more general 'what'.

There are many books here; which did you read?
Compare with
ThatWhatWhenWhereWhoWhomWhoseWhy
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