19203
Recently , once - daily administration of FTC / TDF was approved in the USA for pre - exposure prophylaxis in conjunction with safer sex practices to reduce the risk of sexually acquired HIV - 1 in high - risk adults who are not infected .
 Chemical: FTC; Chemical: TDF
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: FTC, TDF 
Answer:
 Chemical: FTC; Chemical: TDF