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
A person's X-ray chest showing homogenous opacity on right side writh shifting of mediastinum on opposite side. Most probable diagnosis is/are: 
Select and explain. 
A. Collapse, B. Pleural effusion, C. Pneumothorax, D. Consolidation
B: Pleural effusion
Answer: B: Pleural effusion 
Explanation: 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