Discussion
What conclusion does an open world reasoner refuse to draw?
Answer: B
Under the open world assumption silence is not denial, so a patient with no recorded allergy is not thereby known to have none, which is exactly the right behaviour in that domain. Distinctness also requires explicit statement unless a unique names assumption is made. Asserted facts are of course accepted. Refusing to draw a conclusion that a closed world system would draw automatically is the safety property that makes the assumption appropriate where completeness cannot be guaranteed.
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