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': 'The Thymus is located in \nSelect and explain. \nA. Superior mediastinum, B. Middle mediastinum, C. Posterior mediastinum, D. Anterior mediastinum', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The thymus is a bilobed structure, made up of two pyramidal lobes of unequal size which are connected together by areolar tissue. Each lobe develops from the endoderm of the third pharyngeal pouch. It lies on the pericardium, the great vessels of the superior mediastinum, and the trachea. Small detached thymic nodules may be found in the neck.Ref: BD chaurasia; Volume 3; 6th edition; Page no: 172', 'role': 'assistant'}]