You're making this too easy for the Geophiles - you're giving them the capital, a second city & a first letter.
My suggestion is to group this by country, have the clue as the description of one city and the answer as the city name.
Example:
Netherlands | Amsterdam | Official capital
Netherlands | The Hague | Defacto seat of the government
Sri Lanka | Colombo | Commercial capital
Sri Lanka | Sri Jayawardenapura | Administrative capital
Great concept, just needs work on the execution. |