X: Medical research on animals should not be reduced in response to a concern for animals, because results of such research serve to avert human suffering. In such research a trade-off between human and animal welfare is always inevitable, but we should give greater weight to human welfare. Y: With technology that is currently available, much of the research presently performed on animals could instead be done with computer modeling or human subjects without causing any suffering. The relationship of Y's response to X's argument is that Y's response ["supplies a premise to X's argument that was not explicitly stated", 'disagrees with X about the weight to be given to animal suffering as opposed to human suffering', "presents a logical consequence of the premises of X's argument", "contradicts a premise on which X's argument relies"]