Pappu, a 2 yrs old boy,is brought with sudden onset of stridor and respiratory difficulty.The chest examination reveals decreased breath sounds and wheeze in the right side.The chest X-Ray showed an opaque right hemithorax.Which of the following is the most likely diagnosis:

• A. Massive pleural effusion
• B. Foreign body aspiration
• C. Pneumothorax
• D. Acute epiglottitis