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Gymnema sylvestre ( CS 149 ) , known to be a rich source of saponins and other valuable phytochemicals , has been analysed for antimicrobial activity .
 Chemical: saponins
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: saponins 
Answer:
 Chemical: saponins