An LLM confidently generates a plausible-sounding but factually incorrect citation. What is this phenomenon called?
A.Grounding
Grounding is the FIX, not the failure.
B.Hallucination
Fluent-but-false = hallucination. Correct.
C.Overfitting
Overfitting is an ML training issue, not generation-time falsehood.
D.Prompt injection
Injection is an attack — not spontaneous false output.
Why this answer
Hallucination = fluent but false output — an inherent LLM risk because models predict plausible text, not verified truth. Mitigations: grounding (RAG), prompt constraints, human review. Prompt injection is adversarial input manipulation — different threat.
Correct answer: B · Last reviewed 2026-02-14
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