This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Umblicial cord and diaphragm, Subject name: Anatomy
[{'content': 'Constrictions of esophagus when measured from upper incisors are present at \nSelect and explain. \nA. 15cm, 20cm, 40cm, B. 15cm, 25cm, 40cm, C. 20cm, 30cm, 40 cm, D. 30cm, 40cm, 60 cm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: At- 15 cm (6 inch) from incisor at cricophyrangeal junction behind the cricoid cailage () At 25 cm Broncho-aoic constriction(23+28[?]50/2[?]25cm) At 40 cm(15 inch) from incisor -esophageal hiatus where it passes through the diaphragm in the posterior mediastinum(T10) At 23 cm(9 inch) from incisor -due to crossing of arch of aoa in front in the superior mediastinum() At 28 cm (11 inch)from incisor -esophagus is compressed by the left main bronchus in the posterior mediastinum()', 'role': 'assistant'}]