with a colorable argument based on lack of exhaustion, therefore, may raise it in a dispositive motion, to be addressed promptly by the court. See id. The proper procedural mechanism for such a dispositive motion will vary with the circumstances of the case. In many instances, a motion to dismiss under Fed. R.Civ.P. 12(b)(6) will be appropriate. As we have stated, the final administrative decision is central to a prisoner’s claim, so that the prisoner is required to plead exhaustion and provide evidence of exhaustion. If he does not, he has failed to state a claim and the complaint is vulnerable to dismissal. In deciding a Rule 12(b)(6) motion based on exhaustion, the court may consider the attached administrative materials. See Oxendine v. Kaplan, 241 F.3d 1272, 1275 (10th Cir.2001) (<HOLDING>). And if the prisoner “does not incorporate by
holding that 1 the complaint is deemed to include any documents incorporated in it by reference and any document upon which it solely relies and which is integral to the complaint and that the court may consider such documents on a motion to dismiss pursuant to fedrcivp 12b6 holding that court may look both to complaint itself and to any documents attached as exhibits to complaint holding that it was appropriate for the district court to refer to the documents attached to the motion to dismiss since the documents were referred to in the complaint holding that for the purposes of deciding a motion to dismiss courts take allegations as true unless contradicted by  documentary evidence  from the exhibits attached to the complaint holding that the court may consider an article not attached to the complaint in determining whether to dismiss the complaint because the article was integral to and explicitly relied on in the complaint and because the plaintiffs did not challenge its authenticity