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The first breakthrough in the detection of arsenic poisoning was in 1775 when Carl Wilhelm Scheele discovered a way to change arsenic trioxide to garlic-smelling arsine gas ( AsH ) , by treating it with nitric acid ( HNO ) and combining it with zinc .
 Carl Wilhelm Scheele
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carl Wilhelm Scheele