26698
RATIONALE : Although a number of studies investigated the link between major depressive disorder ( MDD ) and metabolic syndrome ( MetS ) , the association between MetS and treatment - resistant depression ( TRD ) is still not clear .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None