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Unfortunatelly there is a single drug for the treatment of all forms of schistosomiasis , praziquantel , which was introduced in therapy in 1980 .
 Chemical: praziquantel
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: praziquantel