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Carbon sources and medium pH affects the growth of Withania somnifera ( L . ) Dunal adventitious roots and withanolide A production .
 Chemical: Carbon; Chemical: withanolide A
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: Carbon, withanolide A 
Answer:
 Chemical: Carbon; Chemical: withanolide A