11254
The activity of superoxide dismutase was down - regulated while the level of malondialdehyde was up - regulated in rat brain .
 Chemical: superoxide; Chemical: malondialdehyde
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: superoxide, malondialdehyde 
Answer:
 Chemical: superoxide; Chemical: malondialdehyde