MCQOPTIONS
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| 1. |
Isthmus of thyroid is at the level of - |
| A. | 1st and 2nd ring |
| B. | 2nd and 3rd ring |
| C. | 3rd and 4th tracheal ring |
| D. | 5th and 6th ring |
| Answer» C. 3rd and 4th tracheal ring | |