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': 'Blood supply of thoracic part of esophagus \nSelect and explain. \nA. Aorta, B. Inferior thyroid artery, C. Gastric artery, D. Superior thyroid artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Blood supply of thoracic part of oesophagus is aorta.', 'role': 'assistant'}]