2101
The Registry for Liver Tumors Associated with Oral Contraceptives at the University of California , Irvine , has clearly identified 27 cases .
 Disease: Liver Tumors; Chemical: Oral Contraceptives
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:
 Disease: Liver Tumors; Chemical: Oral Contraceptives