difference between 'whose' and 'who'

[Whoy]

English Error, Elementary Level

ESL/EFL Test #5 "Relative Pronouns", question 7

The police want to find out whose drove the red car into the shop window.

(a) The
(b) whose
(c) the

English Error, Elementary Level

ESL/EFL Test #5 "Relative Pronouns", answer 7

The police want to find out who drove the red car into the shop window.

Correct entry: who
The error was: (b) whose
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sorry, I don't undarstand it... want to also say that I like this tests very much.. just great:))

Whoy

[Alan]

Hi,

'Who' is a relative pronoun that refers to the unknown driver -they want to find out (the driver ) who drove ....

Alan
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English as a Second Language
You can read my ESL story Passive Voice