This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax: Aerial supply, Subject name: Anatomy
[{'content': 'During surgery of a 56-year-old man for squamous cell carcinoma of neck, the surgeon notices profuse bleeding from deep cervical aery. Which of the following aeries must be ligated immediately to stop bleeding? \nSelect and explain. \nA. Costocervical trunk, B. Transverse cervical aery, C. Thyrocervical trunk, D. Inferior thyroid aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The surgeon should ligate costocervical trunk because it divides into deep cervical aery and superior intercostal aeries. Thyrocervical trunk gives off suprascapular, transverse cervical and inferior thyroid aery. Ascending cervical aery is a branch of inferior thyroid aery.', 'role': 'assistant'}]