With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Long before ( September 1560 ) Dr. Lopez had been the personal house doctor of Robert Dudley and the good doctor was obligated to write the death certificate for Amy Robsart ( stating that she had `` accidentally `` fallen down the stairs ) .
text_B: The obligating did not happen
not-entailed.