Answer : 2. "A type of medicine"
Explanation :

Recent discussions between the United States and China have focused on joint efforts to combat the influx of fentanyl into the US. Fentanyl, a powerful synthetic opioid, has wreaked havoc in the US and has been linked to materials produced in China. This drug, 50 times more powerful than heroin and 100 times more powerful than morphine, is approved by the FDA (Food and Drug Administration) for severe pain, but is also manufactured and sold illegally, often mixed with other drugs , which increases the risk of addiction and has an increased risk of mortality when taken in large doses or when combined.