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
Which of the following is most appropriate step of management in a patient who comes to emergency dept with breathlessness and X-ray showing following findings? 
Select and explain. 
A. Order for HRCT Scan, B. Thoracocentesis, C. Plan for the inseion of chest tube, D. Wait and watch
C: Plan for the inseion of chest tube
Answer: C: Plan for the inseion of chest tube 
Explanation: Note:- the unilateral left sided hyperlucency devoid of any lung markings suggesting left pneumothorax. Ina small simple pneumothorax, observation alone may be sufficient, while in a more major pneumothorax a chest drain is more effective and safer, paicularly if the patient is symptomatic or has underlying lung disease. In the present case, Plain inseion of intercostal drain/chest tube (X-ray shows left sided pneumothorax).This X-ray shows left sided pneumothorax . There is relative flattening of the left dome and some mediastinal shift to right. Patient has breathlessness and these all features suggest treatment with inseion of intercostal drain.