This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Emergency Clinical Scenario, Subject name: Medicine
Where is the cardiac plexus located? 
Select and explain. 
A. Posterior to the bifurcation of the trachea, B. Anterior to the bifurcation of the trachea, C. Anterior to the left hea border, D. Posterior to the apex of the hea
B: Anterior to the bifurcation of the trachea
Answer: B: Anterior to the bifurcation of the trachea 
Explanation: Cardiac plexus Plexus of nerves situated at the base of the hea. Formed by cardiac branches derived from both the sympathetic and parasympathetic nervous systems. Divided into : Superficial pa : Lies beneath aoic arch , in front of the right pulmonary aery Deep pa : Situated in front of the tracheal bifurcation above the point of division of the carina and behind the aoic arch.