My mother, at the time of her death, and for some time before it, was taking a tonic containing strychnine.
My mother was drinking a tonic when she died, but it isn't what killed her.
mnli hypothesis: My mother was drinking a tonic when she died, but it isn't what killed her. premise: My mother, at the time of her death, and for some time before it, was taking a tonic containing strychnine.