A student recently wrote us: "Answer D gives an answer with regards to Kidney function. No where in the passage does it address this and the explanations are insufficient in defending this statement on kidney disease?"
The passage does mention kidneys at the beginning of passage 2. However, "kidney disease" in this answer is to remove it from consideration as a confounder. Based on the data in figure 1, we can safely conclude that the patient has an issue with cardiac muscle function, which is consistent with answer choice D.
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