4551
Forty - two Chinese HBsAg carriers were randomized to receive placebo ( 6 patients ) or lamivudine orally in dosages of 25 mg , 100 mg , or 300 mg daily ( 12 patients for each dosage ) .
 Chemical: HBsAg; Chemical: lamivudine
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: HBsAg; Chemical: lamivudine