Which city is the capital of Argentina?

Buenos Aires is the capital of Argentina and is also its largest city. This vibrant metropolis is located on the eastern shore of the Río de la Plata estuary. It serves as the political, cultural, and economic center of the country, housing the government and the presidential residence. Known for its rich history, European-style architecture, and cultural landmarks, Buenos Aires plays a crucial role in Argentina's national identity. The other cities listed, such as Santiago, Caracas, and Montevideo, are capitals of different countries: Santiago is the capital of Chile, Caracas is the capital of Venezuela, and Montevideo is the capital of Uruguay, thereby distinguishing Buenos Aires as the correct answer.