What refugee-producing country was declared by the United Nations to be the world's worst humanitarian crisis before the Covid-19 pandemic?

Question

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Yemen was declared by the United Nations to be the world's worst humanitarian crisis before the Covid-19 pandemic, with millions of people displaced, famine and disease outbreaks, and ongoing conflict. The other options, Afghanistan, Russia, and Somalia, have also experienced significant humanitarian crises, but Yemen has been deemed the worst.

What Refugee-Producing Country Was Declared by the United Nations to Be