43.At which level of vertebrae does trachea divide into right and left primary bronchi? A. 4 th cervical B. 5 th cervical C. 5 th thoracic D. 7 th thoracic
Option B Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of 5th thoracic vertebra into a right and left primary bronchi.
