29128
Treatment with Captopril was used as a positive control , which has previously been shown to prevent CHF , and rats without LAD - ligation were used as a negative control .
 Chemical: Captopril
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: Captopril 
Answer:
 Chemical: Captopril