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
Thyrocervical trunk is branch of 
Select and explain. 
A. 1st, B. 2nd, C. 3rd, D. None
A: 1st
Answer: A: 1st 
Explanation: The thyrocervical trunk is a sho, wide vessel which arises from the front of the first subclan aery, close to the medial border of scalenus anterior and between the phrenic and vagus nerve. It almost immediately divides into inferior thyroid, suprascapular, transverse cervical aeries Ref BDC volume3,sixth edition pg 150