Monte Carlo is not a city. The 4 then-existing municipalities of Monaco were merged into one in 1917. The constitution of Monaco is at: http://en.gouv.mc/Government-Institutions/Institutions/Constitution-of-the-Principality#eztoc1036069_10 "Art. 78. The territory of the Principality forms a single commune. Art. 79. (amended by Law n°1.249 of April 2nd 2002) - The Commune is administered by a municipality composed of the mayor and deputies designated by the Communal Council from amongst its members."
You need to accept "Dar es salaam" without capital letters, nobody cares about them. Also please check, what you made, and decide, what is city and what is metro and which one you want in your quiz. For example "Omdurman" and "Quezon city" are largely seen as parts of their national capitals. On the other hand Karachi city area cannot be 18m, same for Mumbai. You probably miss few countries (Italy, Netherlands, Israel).