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This work deals with optimisation of adventitious root suspension culture of Withania somnifera ( L . ) Dunal ( Solanaceae ) for the production of biomass and withanolide A and we investigated the effect of carbon source and the initial medium pH on growth and production of withanolide A in adventitious root cultures of Withania somnifera .
 withanolide A, carbon, withanolide A
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 withanolide A, carbon, withanolide A