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No preferential toxicity was observed when folic acid receptors were saturated with free folic acid prior to exposure to nanoparticles .
 Chemical: folic acid; Chemical: folic acid
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: folic acid, folic acid 
Answer:
 Chemical: folic acid; Chemical: folic acid