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: Unknown
[{'content': 'The internal thoracic artery is a branch of - \nSelect and explain. \nA. Arch of aorta, B. Subclavian artery, C. Superior epigastric artery, D. Thyrocervical trunk', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b'i.e., Subclavian artery Internal thoracic arteryo It arises from 1st part of subclavian artery and descends through anterior ends of upper six intercostal spaces lying 1[?]25 cm lateral to sternal margin.o It divides into two terminal branches, musculophrenic and superior epigastric in 6th intercostal spaceo Branches of internal thoracic artery are:-i) Mediastinal branchesii) Pericardial branchesiii) Sternal branchesiv) Pericardiophrenic branchesv) Anterior intercostal arteries (in upper six spaces)vi) Perforating branchesvii) Two terminal branches, musculophrenic and superior epigastric.", 'role': 'assistant'}]