Anchor: Not in a case of poisoning. Mrs. Cavendish's clear voice startled me. 
Entailed: "Not in a case of poisoning" Mrs. Cavendish said.
Contradiction: Poison was involved.
Contradiction: She didn't acknowledge anyone during the introduction. 
Contradiction: Three coworkers stand together, and one of them points something out.
Contradiction: The two hikers are hiking in a rain storm.
Contradiction: No options come to mind about the school situation unless you have further input.