Sentence:  As a useful thought experiment, we imagine an individual faced with what we call the <WSD>black pill</WSD> question. He is offered the chance to take a pill that will kill him instantly and painlessly with a probability he assigns as p. If he takes the pill, he will receive x dollars. Should he accept? 
Meaning of the word marked with <WSD> tags:  A philosophical dilemma in which one is offered a large sum of money in order to take a pill that has a specific probability of resulting in death.