Which statement best distinguishes delusions from ideas of reference and obsessions?

• A. Delusions are fixed false beliefs.
• B. Ideas of reference misinterpret ordinary events as personally significant.
• C. Obsessions are intrusive, distressing thoughts that the patient recognizes as irrational.
• D. Illusions are misperceptions of real external stimuli.

Answer: (A)

A delusion is a fixed belief held with strong conviction despite clear evidence to the contrary. That certainty about something that isn’t true is what sets delusions apart from other related experiences. Ideas of reference involve interpreting ordinary events as having personal meaning, but they aren’t necessarily held as undeniable truths and can be more flexible in light of evidence. Obsessions are intrusive, distressing thoughts that the person recognizes as irrational and tries to resist; they’re not beliefs about the external world, but unwanted thoughts. Illusions are misperceptions of real external stimuli. So the key distinction is the belief’s firmness and falsity: delusions are fixed false beliefs.