<prompt> Which of the following is true about right principal bronchus?Sho and thinSho and broadLong and broadLong and thin  <response>: The right main bronchus or right primary bronchus, or right principal bronchus, wider, shoer, and more veical in direction than the left, is about 2.5 cm. long, and enters the right lung nearly opposite the fifth thoracic veebra. The azygos vein arches over it from behind; and the right pulmonary aery lies at first below and then in front of it 