Final answer:
The correct answer to the student's question is "delusions," which are false beliefs maintained despite evidence to the contrary, unlike hallucinations, phobias, or obsessions.
Step-by-step explanation:
The belief that some external person is implanting thoughts into one's consciousness is associated with delusions. Delusions are false beliefs held with strong conviction despite superior evidence to the contrary.
This is different from hallucinations, which involve sensory experiences without the presence of an actual stimulus, phobias, which are persistent fears of particular objects or situations, and obsessions, which are persistent, intrusive thoughts or impulses.