whats the appropriate year of the event?
-A leak at a cooking oil factory contaminated a batch of the rice oil with heat exchanger fluids containing PCBs and related chemicals known as the Yusho incident.

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The Answer of whats the appropriate year of the event?
-A leak at a cooking oil factory contaminated a batch of the rice oil with heat exchanger fluids containing PCBs and related chemicals known as the Yusho incident.

Whats the Appropriate Year of the Event