This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
False about chest trauma 
Select and explain. 
A. ECG done in all cases a\/w sternal fracture, B. Under water seal drainage if a\/w pneumothorax, C. X-ray chest investigation of choice, D. Urgent surgery needed in all cases
D: Urgent surgery needed in all cases
Answer: D: Urgent surgery needed in all cases 
Explanation: 80% of chest injuries can be managed non operatively. Chest radiograph is the initial investigation of choice.If a sucking chest wound is present,this should not be fully closed,but should be covered with a one-way valve,& then an underwater drain should be placed.ECG should be done in all cases associated with sternal injuries to rule out hea damage. Reference:Bailey & Love's sho practise of surgery,25th edition,page no:341