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': 'Lymph vessel which drain the posterior 1/3 rd of the tongue: \nSelect and explain. \nA. Basal vessel., B. Marginal vessel., C. Central vessel., D. Lateral vessel.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]