2780
Future research with larger number of patients is needed to find out modifiable factors that will improve the safety of ribavirin therapy .
 Chemical: ribavirin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: ribavirin 
Answer:
 Chemical: ribavirin