This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'Thoracic duct does not drain \nSelect and explain. \nA. Right upper pa of body, B. Left upper pa of body, C. Right lower pa of body, D. Left lower pa of body', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thoracic duct does not drain right upper half above the diaphragm <img src=" /> B D CHAURASIA\'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME-1 SIXTH EDITION,Page no-286', 'role': 'assistant'}]