What vs which?

[Old Greg]

Good to see you Running Mouth Without Thinking.

Good to see you Leaking Bum Without Manpon.

[Diver]

Lost your sense of humour? Left it up a sheep?

[SimonMac]

I always go on if its an open question you use what.

What are you doing to me?

And which if it is the choice between limited options.

Which is the best way to subdue a unwilling sexual partner, rohypnol or chloroform?

[Diver]

Which is the best way to subdue a unwilling sexual partner, rohypnol or chloroform?

A brick

[TimberWolf]

Which is the best way to subdue a unwilling sexual partner, rohypnol or chloroform?

That sounds wrong to me.

[SimonMac]

That sounds wrong to me.

The grammar or the context?

[TimberWolf]

The grammar or the context?

Whichever. Whatever.

[OwlHoot]

Every time I see a poll - e.g. what Porsche do you drive? my inner voice tells me that it should be which.

I can't find any nice website that explains it succinctly, but I would always go for which if presenting a set of options to choose from.

Am I right, or is what perfectly acceptable?

Poll to follow.

I think you're right, but possibly both are OK.

You could try asking about it on english.stackexchange.com