This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which of the following is not removed in radical neck dissection 
Select and explain. 
A. Sternocleidomastoid muscle, B. Digastric muscle, C. Spinal accessory nerve, D. Internal jugular vein
B: Digastric muscle
Answer: B: Digastric muscle 
Explanation: Answer- B. Digastric muscle* The radical neck dissection consists of removal of all five lymph node groups of one side of the neck (levels I-V).* This includes removal of the sternocleidomastoid muscle, the internal jugular vein, and the spinal accessory nerve.