1715
Chronic T treatment significantly decreased 5 - HT and 5 - HIAA in certain brain areas , but to a much lesser extent than PCPA .
 Chemical: T; Chemical: 5 - HT; Chemical: 5 - HIAA; Chemical: PCPA
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: T; Chemical: 5 - HT; Chemical: 5 - HIAA; Chemical: PCPA