3018
To understand the toxicity and clinical outcome of melamine exposure , repeated oral dose studies in rats and monkeys were performed to characterize the subchronic toxicity of melamine .
 Chemical: melamine; Chemical: melamine
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: melamine; Chemical: melamine