What must be presented for inspection anytime a pilot is requested by authorities?

The correct answer emphasizes the importance of having both a medical certificate and a pilot certificate readily available for inspection by authorities. These documents serve as proof that the pilot is legally authorized and medically fit to operate an aircraft.

The pilot certificate verifies that the individual has completed the required training and testing to fly, while the medical certificate confirms that the pilot meets the health standards necessary to safely operate an aircraft. Together, these documents ensure compliance with aviation regulations set by authorities and help maintain safety standards in aviation operations.

Having other documents, like flight plans, navigation logs, local flying regulations, or maintenance documents, may be important for various operational situations, but they are not universally required for inspection as a primary responsibility like the medical and pilot certificates.