Why was Dahl's height considered problematic by the English doctor?

Dahl's height was deemed problematic because he was considered too tall for pilots, which was a concern during his training and service as a fighter pilot. In aviation, there are specific requirements relating to the physical size of pilots, as the cockpit dimensions can be limiting. A pilot's height significantly impacts their ability to operate the aircraft efficiently and safely. Being taller than average could result in discomfort or difficulty in fitting into the cockpit and managing the controls effectively, especially in high-stress combat situations. Thus, Dahl's height raised concerns regarding his adaptability and suitability for the role, making this the right answer.