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The biomass of adventitious roots was optimal when the initial medium pH was 5 . 8 ( 113 . 26 g L ( - 1 ) FW and 11 . 33 g L ( - 1 ) DW ) but the withanolide A production was highest at the medium pH level of 5 . 5 ( 9 . 09 mg g ( - 1 ) DW ) .
 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