28979
Ecological studies in Taiwan , Chile , Argentina , Bangladesh , and Mexico have confirmed significant dose - dependent associations between ingestion of arsenic - contaminated drinking water and the risk of various human malignancies .
 Chemical: arsenic
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: arsenic