Final answer:
A rigid bronchoscopy is the preferred method for removing foreign objects from the bronchus due to its larger working channel and better control for the surgeon.
Step-by-step explanation:
A rigid bronchoscopy is preferred for the retrieval of a foreign body from a bronchus. This procedure allows a surgeon to use rigid instruments to remove the object with more control and direct visualization. In comparison to a flexible bronchoscopy, which is typically used for diagnostic purposes, the rigid bronchoscopy provides a larger working channel to grasp and remove foreign objects from the airways. When foreign bodies are aspirated into the respiratory system, prompt removal is critical to prevent airway obstruction and subsequent breathing difficulties. If less invasive measures, such as the Heimlich maneuver, fail to eject the object, medical professionals may resort to rigid bronchoscopy to safely and effectively clear the obstruction.