Small Room

You are in a small room. The walls are closing in on you. You're spontaneously combusting. To top it all off, there's a wild boar eating your leg.

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Inventory
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1.A fire extinguisher
2.A bucket of milk
3.A crowbar
4.A shotgun
5.A grappling rope
6.A grenade

What do you do?
Comment your answer.