Answer:
What room do ghosts avoid?
You throw me out when you use me and take me in when you are done.
Everyone has me except for a few. You may not be able to identify me but I can always identify you. What am I?
I carry you down a gentle stream.
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.