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
Thyocervical trunk is a branch of 
Select and explain. 
A. 1st, B. 2nd, C. 3rd, D. None
A: 1st
Answer: A: 1st 
Explanation: 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.