Please answer the following question: Information: - Gustavo Eliseo Morinigo Vazquez (born 23 January 1977 in Coronel Blas Garay, Paraguay) is a Paraguayan football manager and former Paraguayan footballer who played as a midfielder. - Sergio Aquino ( born 21 September 1979 in Clorinda , Formosa ) is a Paraguayan football player of Argentine descent who currently plays for Paraguayan side Club Libertad . He has formerly played for Cerro Porteno and Olimpia of Asuncion . He has also represented the Paraguayan national team in international games between 2008 and the present day . - Clorinda is a city in the province of Formosa, Argentina. It is the head town of the Pilcomayo Department, and has 47,240 inhabitants as per the . It is located 115km north-northeast from the provincial capital Formosa, at the easternmost tip of the province, 4km from the Paraguayan border, on the right bank of the Pilcomayo River, 10km before its confluence with the Paraguay River. Opposite Clorinda lies the Paraguayan capital Asuncion. The two cities are linked by the San Ignacio de Loyola International Bridge. Clorinda also marks the junction between National Route 11 and National Route 86. - Club Cerro Porteno is a professional Paraguayan football club, based in the neighbourhood of Barrio Obrero in Asuncion. Founded in 1912, Cerro has won 31 Primera Division titles and is one of the most popular football clubs in Paraguay. Its actual president is Juan Jose Zapag, from Paraguay, and the DT is Gustavo Morinigo. Its main rivals are Olimpia and Libertad. - Paraguay, officially the Republic of Paraguay, is a landlocked country in central South America, bordered by Argentina to the south and southwest, Brazil to the east and northeast, and Bolivia to the northwest. Paraguay lies on both banks of the Paraguay River, which runs through the center of the country from north to south. Due to its central location in South America, it is sometimes referred to as "Corazon de Sudamerica" ("Heart of South America"). Paraguay is one of the two landlocked countries (the other is Bolivia) that lie outside Afro-Eurasia. Paraguay is the smallest landlocked country in the Americas. After reading the paragraphs above, we are interested in knowing the entity with which 'sergio aquino' exhibits the relationship of 'position played on team / speciality'. Find the answer from the choices below. Choices: - center - midfielder - opposite
A:
midfielder