1971 Iraq poison grain disaster
{'<entity_0>': '1971 Iraq poison grain disaster', '<entity_1>': 'mercury poisoning', '<entity_2>': '1971', '<entity_3>': 'disaster'}
[['1971 Iraq poison grain disaster', 'instance of', 'mercury poisoning'], ['1971 Iraq poison grain disaster', 'instance of', 'disaster'], ['1971 Iraq poison grain disaster', 'start time', '1971']]
The <entity_0> was a mass methylmercury poisoning incident that began in late <entity_2>. The <entity_2> poisoning was the largest <entity_1> <entity_3> when it occurred, with cases peaking in January and February 1972 and stopping by the end of March.
['disaster', 'mercury poisoning']