Which Hungarian castle is a UNESCO World Heritage Site?

Which Hungarian castle is a UNESCO World Heritage Site?

A Buda Castle
B Füzér Castle
C Vajdahunyad Castle

Buda Castle was built in 1265 but does not have the mediaeval appearance you might expect. The Baroque palace that takes up the majority of the site was added to the building complex in the 18th century. This UNESCO World Heritage Site sits overlooking the Danube River, the second-longest river in Europe.

The correct answer is Buda Castle.