What document verifies the validity of a pilot license?

The correct answer is the medical, as it is a vital document that demonstrates a pilot's fitness to fly and validates their pilot license. In Canada, the medical certificate is required to hold a valid pilot license, and it must be renewed periodically based on the class of the license and the age of the pilot. This document confirms that the pilot meets the necessary medical standards set by the aviation authorities, which is crucial for ensuring safety in aviation operations.

The other documents mentioned, such as the Certificate of Registration, Journey Logbook, and Technical Logbook, serve different purposes. The Certificate of Registration pertains to the aircraft itself and does not validate the pilot's qualifications. The Journey Logbook records the details of flights made by the pilot but does not verify the license's validity. Similarly, the Technical Logbook is used to record maintenance and technical details of the aircraft and is unrelated to the validation of a pilot's license.