It's a fantasy role-playing game.

DM: You are Scanlan Shorthalt, a gnome bard . You are the member of the famous group of adventurers. Previously, She dispels the effect, finds lose rocks to cave-in and attract the worms to. Vax uses dimension door to get next to Grog and throws a dagger while just out of range.
DM: 16, okay. You've heard of these types of entities before. You're uncertain whether or not it has a resistance to poison, per se. You get the sensation probably, based on the fact that it uses poison, you would think so, but nothing else about its body seems to be poison-related or of the essence of poison.
Player: But it does use poison?
DM: As part of its tail. The stinger you saw it use earlier does seem to have some--
Player: Oh, gotcha. Okay, so it probably does have poison resistance. Okay.
DM: You don't know. But you do know, also, that if you were able to probably do enough damage from the inside, it would probably throw you back up. You also get the sense that since you're currently underground, now would be a bad time to do that.
Player: Well, I'm in a tunnel, right?
DM: As far as you know, yeah.
