This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory Radiology, Subject name: Radiology
[{'content': 'Comet Tail Sign is Seen in? \nSelect and explain. \nA. Lower Lobe Collapse, B. Round Atelectasis, C. Right Upper Lobe Collapse, D. Left Lower Lobe Consolidation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Comet Tail Sign is seen in Round atelectasis which is a round/oval subpleural opacity in posterolateral pa of lower lobes with converging vessels and airways entering the opacity in a helical fashion usually giving rise to comet tail sign. Flat waist sign is seen in left lower lobe collapse. Golden S sign is seen in right upper lobe collapse due to bronchogenic carcinoma. Spine sign is seen in left lower lobe consolidation. Comet tail sign', 'role': 'assistant'}]