[ { "voice": [ "duration/task_comparison/duration_pair_012.wav" ], "conversations": [ { "from": "human", "value": "Listen carefully: two clips are connected by a short silence. Which segment is shorter? Answer only with a single letter: 'A' if the first segment has a longer duration, 'B' if the second segment has a longer duration. Do not add any explanation, punctuation, or extra text.