2692
Group 1 had a moderate negative correlation between plasma histamine change and systemic vascular resistance ( r = 0 . 58 ; P less than 0 . 05 ) not present in group 4 .
 Chemical: histamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: histamine