Direct Visualization of the Mucosa of the Trachea,the Main Bronchi

Direct visualization of the mucosa of the trachea,the main bronchi and their openings,and most of the segmental bronchi may also include the removal of material for microscopic study and is an integral part of the examination of patients with pulmonary symptoms such as persistent cough or wheezing,hemoptysis,obstruction,and abnormal roentgenographic changes.What diagnostic modality has been described?

A) Standard bronchoscopy
B) Flexible panendoscopy
C) Rigid pulmonary investigation
D) Video bronchogram