Dhaka is still misspelled & Rhine-Ruhr is not greyed out on the quiz. If you don't know how to grey out an answer, set the design to manual mode after fixing the spelling of Dhaka, then change the cell with Rhine-Ruhr to a text cell instead of an answer, adjust the color of the row with Rhine-Ruhr, and delete Rhine-Ruhr in the answer section.
2. It's "Dhaka" not "Dacca"
3. Polycentric areas, such as Rhine-Ruhr, are usually greyed out
4. It's "Nanjing" not "Nankin"
Otherwise, good quiz!