With no explanation, label text_A→text_B with either "False" or "True".
text_A: I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it out. The it is more likely to refer to The chewing gum than The key because The chewing gum is hard to remove from a keyhole
text_B: In "I was trying to open the lock with the key, but someone had filled the  keyhole with chewing gum, and I couldn't get it out. ", The it is more likely to refer to The chewing gum than The key because The chewing gum is hard to remove from a keyhole
True.