21396
Under an acidic environment , the DOX was quickly released from the SPIO nanocomposites due to the cleavage of pH - sensitive acylhydrazone linkages .
 Chemical: DOX
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: DOX 
Answer:
 Chemical: DOX