1600
CONCLUSION : Although the natural occurrence of YMDD motif mutants in lamivudine - untreated patients with chronic hepatitis B has been reported , these mutants were not detected in Iranian lamivudine - untreated chronic hepatitis B patients .
 Chemical: lamivudine; Disease: chronic hepatitis B; Chemical: lamivudine; Disease: chronic hepatitis B
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: lamivudine; Disease: chronic hepatitis B; Chemical: lamivudine; Disease: chronic hepatitis B