As a nurse, how will you approach the instructions given by your doctor to inject a poisonous substance into a patient

This quite hard. You probably get incarcerated anyways. But what I really think you should do is to hide the poison somewhere. Give the patient a proper medicine that will do no harm then when you leave the place, report it to the police or some law enforcers that the doctor tried to murder someone by presenting the poison.

the answer your looking for is c. : )

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