3807
Senescence and gene expression were also observed in the aortas of healthy rats treated with 50 ppm As ( V ) in drinking water for 1 month .
 Chemical: As ( V )
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: As ( V )