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(The complete setup for this game can be found here: lsat/viewtopic.php?t=3405)
The correct answer choice is (E)
Answer choice (A) violates the third rule. Answer choice (B) is impossible because Y cannot respond to H. Answer choice (C) violates the inference made in the setup. Answer choice (D) cannot occur because then there would be no antibiotic for an organism to respond to, a violation of the first rule. Consequently, answer choice (E) is correct.