37074
Traditionally , the base of the incense used is the resin of Boswellia sacra , also known as frankincense , but the resin of fir trees has been used as well .
 Boswellia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Boswellia