2391
Plants are a promising means to produce large amounts of these cocaine hydrolase variants of BChE , cheaply , safely with no concerns regarding human pathogens and functionally equivalent to enzymes derived from other sources .
 Chemical: cocaine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: cocaine 
Answer:
 Chemical: cocaine