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': 'False about External Jugular vein \nSelect and explain. \nA. It is deep to Platysma, B. Formed by anterior division of retromandibular vein and posterior auricular vein, C. It crosses Sternocleidomastoid, D. It drains into Subclan vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The posterior division of the retromandibular vein unites with the posterior auricular vein to form the external jugular vein which ultimately drains into the subclan vein.The external jugular vein crosses the sternocleidomastoid obliquely, running downwards and backwards from near the auricle to the clavicle.Reference: Chourasia; 6th edition; 86th page', 'role': 'assistant'}]