Determine the question that you might have asked to get back the following answer for the given context
Context: Victoria's youngest son, Leopold, was affected by the blood-clotting disease haemophilia B and two of her five daughters, Alice and Beatrice, were carriers. Royal haemophiliacs descended from Victoria included her great-grandsons, Tsarevich Alexei of Russia, Alfonso, Prince of Asturias, and Infante Gonzalo of Spain. The presence of the disease in Victoria's descendants, but not in her ancestors, led to modern speculation that her true father was not the Duke of Kent but a haemophiliac. There is no documentary evidence of a haemophiliac in connection with Victoria's mother, and as male carriers always suffer the disease, even if such a man had existed he would have been seriously ill. It is more likely that the mutation arose spontaneously because Victoria's father was over 50 at the time of her conception and haemophilia arises more frequently in the children of older fathers. Spontaneous mutations account for about a third of cases.;
Answer: the blood-clotting disease haemophilia B;
Question:
What disease did Victoria's youngest son have?
The answer to the question "What disease did Victoria's youngest son have?" is: The blood-clotting disease haemophilia B
In this context, Victoria refers to Queen Victoria of the United Kingdom. 
Her youngest son was Leopold George Duncan Albert who suffered from a rare genetic disorder called Haemophilia type B which affects males and causes them to bleed more profusely than normal people even with minor cuts or bruises as their blood does not clot easily..