An 82-year-old man with metastatic lung cancer and a valid Advance Care Directive (ACD) is admitted with sepsis from a urinary tract infection. The ACD clearly states he refuses all life-sustaining treatments, including intravenous antibiotics and admission to an intensive care unit. The patient is now delirious and lacks decision-making capacity. His family is adamant that he should receive antibiotics, stating, "He wouldn't want to die from a simple infection." What is the most appropriate and legally defensible course of action for the treating doctor?
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A
Follow the family's wishes and commence intravenous antibiotics.
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B
Seek an urgent ethics committee review before making a decision.
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C
Uphold the patient's refusal of treatment as stated in the valid ACD.
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D
Provide palliative care but administer antibiotics for comfort.