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The brain GABA - benzodiazepine receptor alpha - 5 subtype in autism spectrum disorder : a pilot [ ( 11 ) C ] Ro15 - 4513 positron emission tomography study .
 GABA, benzodiazepine, [ ( 11 ) C ] Ro15 - 4513
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 GABA, benzodiazepine, [ ( 11 ) C ] Ro15 - 4513