Title: Porto
Content:  Porto or Oporto is the second-largest city in Portugal, the capital of the Porto District, and one of the Iberian Peninsula's major urban areas. Porto city proper, which is the entire municipality of Porto, is small compared to its metropolitan area, with an estimated population of just 231,962 people in a municipality with only 41.42 km2. Porto's metropolitan area has around 1.7 million people (2021) in an area of 2,395 km2, making it the second-largest urban area in Portugal. It is recognized as a global city with a Gamma + rating from the Globalization and World Cities Research Network. Located 
Title: List of cities in Portugal
Content:  Carnation Revolution, proclamation of cities returned to parliament and now, Portugal has 156 cities, one of the consequences being that the title no longer holds the prestige it once had. Eight locations have been always considered cities since Portugal became an independent kingdom (de facto 1128): Braga, Coimbra, Lamego, Porto and Viseu, as well as Évora, Lisbon and Silves, which were annexed at a later date. Guarda was the first city proclaimed as part of the independent kingdom, in 1199. The most recent cities are : Albergaria-a-Velha, Alfena, Lagoa (Azores), Valença, Senhora da Hora, São Pedro do Sul, Samora Correia, and Borba. The most populous cities are: Lisbon (Lisboa), Porto, Vila Nova de Gaia, Braga, Amadora, Queluz, Funchal, Coimbra, Setúbal, Agualva-Cacém, Almada, Rio Tinto, Aveiro, Viseu, Odivelas, Leiria, Guimarães, Barreiro, Évora, Faro, Portimão and Ponta Delgada.
Title: Portugal
Content:  Portugal has been a semi-presidential representative democratic republic since the ratification of the Constitution of 1976, with Lisbon, the nation's largest city, as its capital. The Constitution grants the division or separation of powers among four bodies referred as "organs of Sovereignty": the President of the Republic, the Government, the Assembly of the Republic and the Courts. The President, who is elected to a five-year term, has an executive role: the current President is Marcelo Rebelo de Sousa. The Assembly of the Republic is a single chamber parliament composed of a maximum of 230 deputies elected for a four-year term. The Government is headed by the Prime Minister (currently António Costa) and includes Ministers and 
Title: Porto District
Content:  The District of Porto (Distrito do Porto ) is located on the north-west coast of Portugal. The district capital is the city of Porto, the second largest city in the country. It is bordered by the Aveiro and Viseu districts to the south, Braga district to the north and Vila Real district to the east. Its area is 2395 km2 and its population is 1,817,172. In 2017, the main legal foreign populations were from Brazil (9,442), China (2,475), Ukraine (2,160), Italy (1,273), Spain (1,189), Angola (1,118), and Cape Verde (1,040). These numbers exclude those who obtained Portuguese citizenship, which is regular among recent Portuguese Brazilians or Portuguese-Africans.
Title: Capital city
Content:  capital city. The presidential palace (Malacanang Palace) and the Supreme Court are located within the capital city but the two houses of Congress are located in separate suburbs. ; Portugal: The Portuguese constitution has no reference to a capital. Although Lisbon is home to the Parliament, the President's and the Prime Minister's official residences, all the Government's departments, all the embassies and the highest courts, no Portuguese official document states that Lisbon is the national capital. ; Sri Lanka: Sri Jayawardenepura Kotte is designated the administrative capital and the location of the parliament, while the former capital, Colombo, is now designated as the "commercial capital". 
Title: Outline of Portugal
Content: Politics of Portugal ; Form of government: unitary semi-presidential representative democratic republic ; Capital of Portugal: Lisbon ; Elections in Portugal ; Political parties in Portugal 
Title: History of Porto
Content:  Porto is the second largest city in Portugal behind the capital, Lisbon.
Title: Porto
Content:   Porto and the conurbation to which it belongs is a major industrial and financial center of both Portugal and the Iberian Peninsula. As the most important city in the heavily industrialized northwest, many of the largest Portuguese corporations from diverse economic sectors, like Altri, Ambar, Amorim, Bial, Cerealis, BPI, CIN, EFACEC, Frulact, Lactogal, Millennium bcp, Porto Editora, Grupo RAR, Sonae, Sonae Indústria, and Unicer, are headquartered in the Greater Metropolitan Area of Porto, most notably, in the core municipalities of Maia, Matosinhos, Porto, and Vila Nova de Gaia. The city's former stock exchange (Bolsa do Porto) was transformed into the largest derivatives exchange of Portugal, and merged with Lisbon Stock Exchange to create the Bolsa de Valores de Lisboa 
Title: List of cities in Portugal
Content:  This is a list of cities in Portugal. In Portugal, a city (cidade) is an honorific term given to locations that meet several criteria, such as having a minimum number of inhabitants, good infrastructure (schools, medical care, cultural and sports facilities), or have a major historical importance. The country's demographic expansion of the 1980s prompted the elevation of several towns to city status and, as of 2018, 159 locations in Portugal are considered a city.
Title: Funchal
Content:  Funchal is the largest city, the municipal seat and the capital of Portugal's Autonomous Region of Madeira, bordered by the Atlantic Ocean. The city has a population of 111,892, making it the sixth largest city in Portugal, and has been the capital of Madeira for more than five centuries. Because of its high cultural and historical value, Funchal is one of Portugal's main tourist attractions. It is also popular as a destination for New Year's Eve, and it is the leading Portuguese port on cruise liner dockings.

Question: What is the capital of Portugal?
Answer: Lisbon.
Lisboa.