Question # 1
Choose the best answer; that is the response that most accurately and completely answers the question.
Q,1-2. In an in vitro study 160 white cats were injected with Salt X. 160 other white cats were injected with placebo. In two weeks 39% of the white cats who were injected with Salt X showed symptoms of Key fever? Hence it can be concluded that key fever is caused by some elements similar to the elements in Salt X.
1. Which of the following statements would most seriously weaken the above discussion?

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