This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': "A person's X-ray chest showing homogenous opacity on right side with 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: Answer- (B) Pleural effusionPneumonectomy chest (Early sip: within 24 hr): Paial filling of thorax, ipsilateral mediastinal shift & diaphragmatic elevation.Homogenous opacityShift of mediastinum to the opposite sideConcave upper border (Ellis's curve)", 'role': 'assistant'}]