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Cyanide is one of the best known of all poisons. Perhaps best known as the suicide pills reputedly carried by secret agents it was also the active ingredient in the gas (Zyklon B) used by the Nazis in extermination camps such as Auschwitz.
Answer: Arsenic is a poisonous chemical often used in herbicides and pesticides and is classified as a Class 1 carcinogen, meaning it is highly toxic to humans. Other Class 1 carcinogens include asbestos, formaldehyde and hepatitis B and C viruses.