Text: He clutched Poirot by the arm, and sank his voice to a whisper: "Just tell me this, Mr. Poirot, it isn't, it isn't strychnine, is it?" I hardly heard what Poirot replied.
Entailment: He asked Poirot if it had been strychnine.
Contradiction: He was too nervous to say anything to Poirot.