15406
We investigated the mechanisms of ritonavir - mediated enhancement effect on the pharmacokinetics of saquinavir using in vivo probes for CYP3A4 ( midazolam ) , p - glycoprotein ( fexofenadine ) , and OATP1B1 ( pravastatin ) following oral micro / small dosing .
 Chemical: ritonavir; Chemical: saquinavir; Chemical: midazolam; Chemical: fexofenadine; Chemical: pravastatin
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: ritonavir, saquinavir, midazolam, fexofenadine, pravastatin 
Answer:
 Chemical: ritonavir; Chemical: saquinavir; Chemical: midazolam; Chemical: fexofenadine; Chemical: pravastatin