A 68-year-old man with metastatic lung cancer has severe continuous pain despite regular oral Morphine at 10 mg every 4 hours. He is still able to swallow. What is the most appropriate next step in analgesia?AIncrease the regular oral Morphine dose and adjust breakthrough dose accordinglyBSwitch to weak opioids such as CodeineCStop Morphine and use NSAIDs aloneDStart transdermal Fentanyl patch at a low dose without titrationEUse only PRN Morphine without regular dosingCheck my answer