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: Anatomy
Cervical pa of esophagus all are true except? 
Select and explain. 
A. Arise at cricoid level, B. Site of poosystemic anastomosis, C. Foreign body obstruction common at this level, D. Striated muscle fibres positive
B: Site of poosystemic anastomosis
Answer: B: Site of poosystemic anastomosis 
Explanation: Poosystemic (Poo caval) anastomosis is seen in lower pa (abdominal pa) of esophagus.Cervical esophagus begins at lower border of cricoid cailage (at C6 veebral level) as a downward continuation of pharynx.Muscularis externa of cervical esophagus contains only skeletal muscle (striated muscle) fibers.Foreign body obstruction is common in this pa of esophagus.