4684
She had developed a severe acute major depression disorder almost immediately thereafter , possibly related to the use of a serotonin antagonist .
 Disease: major depression disorder; Chemical: serotonin
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: major depression disorder; Chemical: serotonin