18844
Upon immersion in a toluene solution of a RX , theta ( water ) increased due to adsorption of the RX onto gallium substrates .
 Chemical: toluene; Chemical: gallium
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: toluene; Chemical: gallium