Nancy smells smoke when there is no fire. This is an example of:

A) a delusion.
B) a hallucination.
C) paranoia.
D) olfactory inhibition.

Olfactory Inhibition

The decrease in the ability to perceive odors, which can occur temporarily due to factors such as nasal congestion or more permanently from certain neurological conditions.

Delusion

A false belief firmly held despite clear evidence to the contrary, often a symptom of psychiatric disorders such as schizophrenia.

Hallucination

A perceptual experience during wakefulness without external stimuli, often involving sight or sound that seems real but is not.