401
It has been proposed that nitric oxide ( NO ) induced headache in primary headaches may be associated with release of calcitonin gene - related peptide ( CGRP ) .
 Chemical: nitric oxide; Chemical: NO; Disease: headache; Disease: primary headaches
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: nitric oxide, NO, headache, primary headaches 
Answer:
 Chemical: nitric oxide; Chemical: NO; Disease: headache; Disease: primary headaches