14236
Postmenstrual age ( PMA ) was identified as the most significant covariate on central clearance of piperacillin and tazobactam .
 Chemical: piperacillin; Chemical: tazobactam
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: piperacillin, tazobactam 
Answer:
 Chemical: piperacillin; Chemical: tazobactam