|"Are you a wizard or not?"
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On 7 January, 1997, Potions Master Horace Slughorn presented each of his sixth-year Potions students with a phial of this poison so that they could brew an adequate antidote under the principle of Golpalott's Third Law. Harry Potter's very effective solution was a bezoar stone from a goat's stomach, a fact he had learned from Severus Snape's copy of Advanced Potion-Making.
- Harry Potter and the Half-Blood Prince (First appearance)
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