Logical reasoning PrepTest 117 · Section 2 · Question 2

Incorrect. The stimulus compares the risk of coronary bypass surgery to other therapies that would be as effective, not to all other therapies.

Incorrect. There's no discussion of the past in the stimulus, so this answer is out of scope.

Incorrect. The Cardiologist notes that such a surgery is especially debatable" when only a single vessel is diseased. But that leaves open the possibility that it's still debatable, just less so, with multiple diseased vessels, so it's unsupported to say that this surgery "should" be performed in those cases.

Incorrect. The debate over using coronary bypass surgery to treat single—vessel disease could be because of the risk to reward benefit, not the cost.

Correct. Argument or Facts:
Facts

Question Type:
Must Be True

Stimulus Summary:
Coronary bypass surgery vs. some other therapies:
(1) As effective
(2) More expensive
(3) Less risk
Bypass surgery is especially questionable with single—vessel disease

Answer Anticipation:
This argument compares coronary bypass surgery to other, equally effective therapies. As such, we should be sure that we note the points of comparison before heading to the answer choices that and finding the (likely comparative) answer that lines up with those points!

Answer Explanation:
The stimulus states that there are other therapies that would be as effective, and these other therapies pose less risk, so this answer is supported by the stimulus.

Key Takeaway:
There are certain types of logic/statements that Must Be True questions tend to focus on, and this stimulus is all about comparisons. When a Must Be True stimulus features comparisons (or even just one), make sure to note it.