Four-principle reasoning
Autonomy, beneficence, non-maleficence and justice are useful lenses for organizing ethical problems. Autonomy concerns informed self-determination; beneficence promotes welfare; non-maleficence cautions against unnecessary harm; justice concerns fair treatment and distribution.
The principles can conflict. A patient may refuse a beneficial treatment, or a scarce resource may not be available to every person who could benefit. Naming a principle does not solve the case.
Begin with facts: diagnosis, urgency, capacity, patient wishes, available options and relevant institutional or legal constraints. Then identify which ethical duties support or oppose each option.
A reasoned conclusion should explain why the proposed action is proportionate and how competing values were considered. Ethical reasoning is therefore closer to structured clinical reasoning than to memorizing slogans.
Without reading above, explain the principle in your own words. Then state: (1) why it matters to the patient, (2) one way it can fail in practice, (3) the safest response, and (4) when a student should obtain senior help.
