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Serum and hippocampus malondialdehyde ( MDA ) levels were determined using the thiobarbituric - acid reactive substances method .
 Chemical: malondialdehyde; Chemical: MDA; Chemical: thiobarbituric - 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: malondialdehyde, MDA, thiobarbituric - acid 
Answer:
 Chemical: malondialdehyde; Chemical: MDA; Chemical: thiobarbituric - acid