Afalse personal belief that is maintained despite obvious proof or evidence to the contrary is known as a/an a. delirium b. delusion c. dementia d. hallucinatio

The correct answer is letter b. delusion.

Delusion refers to the false personal belief, wherein an individual believes in his or her knowledge yet does not believe others, though they are right and have sufficient evidence. Being delusional may be cause by the lack of evidence or incomplete knowledge and wrong perception of things.