This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Anatomy
[{'content': 'Thyocervical trunk is a branch of \nSelect and explain. \nA. 1st, B. 2nd, C. 3rd, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Thyrocervical trunk is a sho, wide vessel which arises from the front of the first pa of the subclan aery, close to the medial border of the scalenus anterior, and between the phrenic and vagus nerves. It almost immediately divides into the inferior thyroid, suprascapular and transverse cervical aeries. Ref: BD Chaurasia's HUMAN ANATOMY, Volume 3, 4th edition.", 'role': 'assistant'}]