The esophagus -: (A) Begins at the upper border of cricoid cartilage, (B) Runs a straight course throughout, (C) Is narrowest at its termination, (D) Is narrowest at its beginning
Answer is D. At the lower end of pharynx, at the level of lower border of cricoid cartilage, esophagus begins. It is narrowest at its beginning due to cricopharyngeal sphincter. Then it runs a curved route rather than being straight.