5459
Follow up studies indicated antipsychotic drugs may act by increasing NAA levels in selected brain areas ( the frontal lobe and thalamus ) , especially during the short - time observation .
 Chemical: NAA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: NAA