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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
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: nitric oxide; Chemical: NO; Disease: headache; Disease: primary headaches