16467
Solubilization of organic matter was mostly driven by Al mobilization ( r = 0 . 580 , p < 0 . 05 ) and variations in solution pH .
 Chemical: Al
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: Al 
Answer:
 Chemical: Al