This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pleural Effusion & Pneumothorax, Subject name: Medicine
[{'content': "A person's X-ray chest showing homogenous opacity on right side writh shifting of mediastinum on opposite side. Most probable diagnosis is/are: \nSelect and explain. \nA. Collapse, B. Pleural effusion, C. Pneumothorax, D. Consolidation", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B (Pleural effusion) Pleural effusion: X-ray chest pjm20th/139 Homogenous opacityShift of mediastinum to the opposite sideConcave upper border(Ellis\'s curve)Pneumonectomy chest(Earlv sign: within 24 hr): Partial filling of thorn, ipsilaterai mediastinal shift & diaphragmatic eievation"- Dahnert Radiology 5th/513Table: PjM 20th/139PathologyMediastinumChest wall processConsolidationCentralNormalTotal collapseSame sideRetractionPleural effusionOpposite sideNormalPneumothoraxOpposite sideNormalFibrosisRetractionSame side', 'role': 'assistant'}]