With no explanation, label text_A→text_B with either "False" or "True".
text_A: Sid explained his theory to Mark but he couldn't understand him. The he is more likely to refer to Mark than Sid because Sid would understand his own explanation
text_B: In "Sid explained his theory to Mark but he couldn't understand him. ", The he is more likely to refer to Mark than Sid because Sid would understand his own explanation
True.