With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Sankara pushed for agrarian self-sufficiency and promoted public health by vaccinating 2,500,000 children against meningitis, yellow fever, and measles. His national agenda also included planting over 10,000,000 trees to stop the growing desertification of the Sahel. Sankara called on every village to build a medical dispensary and had over 350 communities build schools with their own labour.
text_B: Will Sankara's agenda in the Sahel lead to worsening desertification?
NO.