medium · LSAT Logical Reasoning

A hospital policy states: 'A surgeon may operate only if a licensed anesthesiologist is present.'

Which one of the following expresses the same policy?

  1. A surgeon's operating is enough to establish that a licensed anesthesiologist is on hand.
  2. If a licensed anesthesiologist is present, then a surgeon is thereby permitted to operate.
  3. If a surgeon is not currently operating, then no licensed anesthesiologist is present at all.
  4. A licensed anesthesiologist is present if and only if a surgeon is actively operating nearby.
  5. Whenever a licensed anesthesiologist is present, a surgeon must therefore be operating then.

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