3200
Aged GF Sprague - Dawley ( SD ) rats have not developed prostate cancer spontaneously .
 Disease: prostate cancer
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: prostate cancer 
Answer:
 Disease: prostate cancer