With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: On 25 May 1997, Bohumil Šole, a scientist who claimed to have been involved with inventing Semtex, committed suicide at a spa in Jeseník by blowing himself up with explosives. Šole, 63, was being treated there for psychological problems. It was unclear what explosives were used. Twenty other people were hurt in the explosion, while six were seriously injured. According to the manufacturer, Explosia, he was not a member of the team that developed the explosive in the 1960s.
text_B: Does the evidence recovered at the scene suggest that Bohumil Šole was trying to repent for his actions in life, or perhaps even to discredit his employer, given his choice of explosive?
NO.