19750
In this study , we determined the ability of seven dietary C - 18 fatty acids to cause cytotoxicity and induce apoptosis in various types of human prostate cancer cells .
 Chemical: C - 18 fatty acids
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: C - 18 fatty acids