An article claims that many medical patients have an instinctual ability to predict sudden changes in their medical status. But the evidence given is anecdotal and should not be trusted. The case is analogous to empirically disproven reports that babies are born in disproportionately high numbers during full moons. Once that rumor remember busy nights with full moons than busy nights without them.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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