16120
Upon studying the drug - drug interaction of darunavir with ketoconazole , data were indicative for an inhibitory effect of ketoconazole on P - gp as the main mechanism for the increased transport of darunavir across the small intestine .
 Chemical: darunavir; Chemical: ketoconazole; Chemical: ketoconazole; Chemical: darunavir
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: darunavir, ketoconazole, ketoconazole, darunavir 
Answer:
 Chemical: darunavir; Chemical: ketoconazole; Chemical: ketoconazole; Chemical: darunavir