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| Q. |
The oesophagus is constricted at the following sites: |
| A. | where it is crossed by right main bronchus |
| B. | where it is crossed by the azygous vein |
| C. | where it is crossed by the left subclavian artery |
| D. | where it is crossed by the thoracic duct |
| E. | none of the above |
| Answer» E. none of the above | |
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