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Arsenicosis was reported in Nakhon Si Thammarat , Thailand in 1987 , and the Chao Phraya River probably contains high levels of naturally occurring dissolved arsenic without being a public health problem because much of the public uses bottled water .
 Nakhon Si Thammarat, Thailand, Chao Phraya River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nakhon Si Thammarat, Thailand, Chao Phraya River