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 plans to halt planting over 10,000,000 trees in the growing desert 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: Can those who live in the Sahel expect better living conditions thanks to Sankara's efforts?
NO.