A 72-year-old male with metastatic prostate cancer to the bone is being transitioned from oral morphine SR 60 mg every 12 hours to a continuous subcutaneous infusion of hydromorphone due to dysphagia. His pain is currently well-controlled. Using a standard equianalgesic table (e.g., 30mg oral morphine = 10mg parenteral morphine; 10mg parenteral morphine = 1.5mg parenteral hydromorphone), what is the most appropriate starting dose for the hydromorphone infusion over 24 hours?
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A
24 mg/24 hours
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B
12 mg/24 hours
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C
6 mg/24 hours
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D
18 mg/24 hours