When comparing the potencies of morphine and fentanyl, which statement is correct?
1. Morphine is 50% more potent than fentanyl.
2. Morphine and fentanyl have about equal potency.
3. Morphine is about 10 times more potent than fentanyl.
4. Fentanyl is about 100 times more potent than morphine.
Correct Answer: 4
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