With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Shortly before this, his illegitimate daughter Isabel was born in November. Her mother, Ana Franca, was the wife of a Madrid inn keeper; they apparently concealed it from her husband, but Cervantes acknowledged paternity. When Ana Franca died in 1598, he asked his sister Magdalena to take care of her.
text_B: Does the passage leave open the possibility that Cervantes was actually not the biological father of Isabel?
YES.