930 - Logical Reasoning

Question: Mr. Primm: If hospitals were private enterprises, dependent on profits for their survival, there would be no teaching hospitals, because of the intrinsically high cost of running such hospitals. Ms. Nakai: I disagree. The medical challenges provided by teaching hospitals attract the very best physicians. This, in turn, enables those hospitals to concentrate on nonroutine cases.
Which of the following, if true, would most strengthen Ms. Nakai's attempt to refute Mr. Primm's claim?

1. Doctors at teaching hospitals command high salaries.
2. Sophisticated, nonroutine medical care commands a high price.
3. Existing teaching hospitals derive some revenue from public subsidies.
4. The patient mortality rate at teaching hospitals is high.
5. The modern trend among physicians is to become highly specialized.