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Based on successful clinical trials , a new single - tablet regimen of elvitegravir , cobicistat , emtricitabine , and tenofovir has been approved for the management of treatment - na i ve patients .
 Chemical: elvitegravir; Chemical: cobicistat; Chemical: emtricitabine; Chemical: tenofovir
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: elvitegravir; Chemical: cobicistat; Chemical: emtricitabine; Chemical: tenofovir