Mistook: Is it when you make an identity error?

[Ulma]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #78 "GMAT Verbal Quiz", question 5

I do apologise for talking to you a minute ago only I ......... you for one of my colleagues, who looks exactly like you.

(a) mistook
(b) accepted
(c) believed
(d) thought

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #78 "GMAT Verbal Quiz", answer 5

I do apologise for talking to you a minute ago only I mistook you for one of my colleagues, who looks exactly like you.

Correct answer: (a) mistook

Your answer was: ?
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is it when you make an identity error?

Ulma

[Ralf]

If you mistook a person for someone else, you incorrectly assumed that you saw someone you knew.
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Test of English as a Foreign Language
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[Ahmadov]

Note that "for" must be used when using "to mistake" in that sense...
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Learning is a sacred engagement.