1513
Bisphosphonate exposure was on average 5 . 5 years ( range 5 to 12 years ) for the AFF and 5 . 4 years ( range 5 to 8 years ) for the LTB groups .
 Chemical: Bisphosphonate
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: Bisphosphonate