23982
Cigarette smoke , diesel exhaust , and other combustion - derived particles activate the calcium channel transient receptor potential ankyrin - 1 ( TRPA1 ) , causing irritation and inflammation in the respiratory tract .
 Chemical: calcium
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: calcium