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Primary dysmenorrhea is a syndrome characterized by painful uterine contractility caused by a hypersecretion of endometrial prostaglandins ; non - steroidal anti - inflammatory drugs are the first choice for its treatment .
 Disease: dysmenorrhea; Chemical: prostaglandins
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:
 Disease: dysmenorrhea; Chemical: prostaglandins