**Core Concept**
Hallucinations are a symptom of various psychiatric and neurological disorders where patients experience perceptions in the absence of external stimuli. These perceptions can be auditory, visual, olfactory, gustatory, or tactile, and are often distressing and disabling.

**Why the Correct Answer is Right**
Hallucinations involve the sensory organs, specifically the receptors and pathways responsible for processing sensory information. For example, auditory hallucinations involve the cochlea, auditory nerve, and auditory cortex, while visual hallucinations involve the retina, optic nerve, and visual cortex. The sensory organs are not bypassed or unaffected in hallucinations, but rather, the normal processing of sensory information is disrupted. This disruption can occur due to various factors, including abnormalities in neurotransmitter systems, such as dopamine and serotonin.

**Why Each Wrong Option is Incorrect**
**Option A:** Hallucinations are often perceived as real by the patient, which is a key characteristic that distinguishes them from illusions.

**Option B:** While some hallucinations may seem to be coming from the external world, others may be internal or subjective, such as hearing one's own voice or seeing a visual image in one's mind's eye.

**Option D:** Hallucinations do occur in the absence of perceptual stimulus, but this statement is not the false statement about hallucinations.

**Clinical Pearl / High-Yield Fact**
A key distinction between hallucinations and delusions is that hallucinations involve perceptions, whereas delusions involve beliefs.

**✓ Correct Answer: C. Sensory organs are not involved**