2675
Prostaglandin F2 alpha had little effect on pain responses .
 Chemical: Prostaglandin F2 alpha; Disease: pain
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: Prostaglandin F2 alpha; Disease: pain