This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'An emergency thoracotomy shown here is known as \nSelect and explain. \nA. Right thoracotomy, B. Clam shell thoracotomy, C. Median sternotomy, D. Left thoracotomy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Clam shell thoracotomy* In emergency the chest cage is opened fully at diaphragm level to look for major vessel injury and repair- this is known as Clam shell thoracotomy', 'role': 'assistant'}]