Adding an extra 'Unknown' option to True/False prompts causes LLMs to abstain on questions they can answer, and random words reproduce the effect, indicating abstention is partly a prompt artifact.
InAdvances in Neural Information Pro- cessing Systems (NeurIPS) 37
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LLM Abstention Can Be a Prompt Artifact, in Addition to Genuine Uncertainty
Adding an extra 'Unknown' option to True/False prompts causes LLMs to abstain on questions they can answer, and random words reproduce the effect, indicating abstention is partly a prompt artifact.