There is already a similar question here, but it is about forming questions: Which is the correct question ("Who has" vs "Who have")?
When combining who with you in a statement, which is correct and why?
It is you who has chosen.
It is you who have chosen.
who is third-person singular, so it takes has. you is second-person, so it takes have.
Does the verb to have conjugate with you or who in this sentence? Which one is correct, or can it vary?