What is the test for a prisoner who alleges he was deliberately deprived of his mental health care by the prison?

prisoner must demonstrate that prison officials were "deliberately indifferent to a serious threat to the inmate's safety." Id. at 834. This requires the prisoner to satisfy both an objective and a subjective component. First, the prisoner must demonstrate that the alleged deprivation was, in objective terms, "sufficiently serious." Id., quoting Wilson v. Seiter, 501 U.S. 294, 298 (1991). Second, the prisoner must demonstrate that prison officials must have known of and disregarded an excessive risk to the prisoner's safety." Id. at 837.