This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'A patient presents with a penetrating chest wound associated with intrathoracic haemorrhage. A thoracotomy is done by taking an incision in the 41h/51h intercostals space staing 1 cm away from the lateral margin of the sternum.This is done to avoid injury to the \nSelect and explain. \nA. Pleura, B. Intercostal aery, C. Internal thoracic aery, D. Intercostal nerve', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Internal thoracic aeryIntercostal (external, internal & innermost) muscles (not transverses thoracic) are pierced in pleural taping in mild axillary line.Latissimus dorsi, serratus anterior, rhomboidus major & intercostal muscles are cut in posterolateral thoracotomy whereas pectoralis is cut in anterior & anterolateral approach.Thoracotomy in upper 6 intercostal spaces is done by taking an incision 1 cm lateral to sternum to avoid injury to internal thoracic (mammary) aeryQ.', 'role': 'assistant'}]