Ethicist: This hospital's ethics code states that hospital staff must not deceive patients about their medical treatment.
Conclusion (So / clearly)
Dr. Faris is in violation of the ethics code. rephrase: Dr. Faris deceived a patient about their medical treatment.
Evidence
The ethic code says, "you mustn't deceive patients about their medical treatment".
Dr. Faris gave medication A to a patient and told him it would help him sleep, even though it has no known sleep-inducing properties (although the patient's sleep did improve after taking medication A).
Evaluate
Is it clear that Dr. Faris deceived her patient? Is there any way that we could argue that even though Med A has no known sleep-inducing properties, she was still being honest in saying "this medication will help you sleep"?
Maybe she thought the placebo effect would help the patient sleep. She knew the medication didn't have sleep altering properties, but she surmised that this patient probably would get some psychological comfort out of receiving some treatment, and that psychological comfort would lead to better sleep.
Or maybe the Dr. was thinking that Med A would alleviate some condition that is keeping the patient awake at night. Maybe medication A does nothing for sleep, but it's good at alleviating the pain from headaches, and the patient can sleep when he has a headache. In that sense, she wouldn't have been deceptive to say "taking this med should help you sleep".
Goal
Look for an answer that gives us a way to argue that the Dr. genuinely believed that if the patient took this Med A, the process of doing so would help him sleep.