13) D

The answer to this question is the last line of the sentence “In the interests of providing the most desirable outcome..”

A – Wrong
Although this is a true statement, it does not support the argument.
B – Wrong
Although this is a true staement, it does not support the argument. 
C – Wrong
Although this is a true statement, it does not support the argument. This may seem to be the correct answer but if placebos do help patients to feel better, then they should be used.
D – Correct
If a treatment (even placebos) provides a beneficial outcome for a patient, then that treatment should be given.
E – Wrong
This may also seem to be the answer but D is more correct as the outcome for the patient is more important and relevant. 

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