22688
The basic science and clinical use of morphine and other " opioid " drugs are based almost exclusively on the extracts or analogues of compounds isolated from a single source , the opium poppy ( Papaver somniferum ) .
 Chemical: morphine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: morphine