Given the question: Information:  - Romantic nationalism (also national romanticism, organic nationalism, identity nationalism) is the form of nationalism in which the state derives its political legitimacy as an organic consequence of the unity of those it governs. This includes, depending on the particular manner of practice, the language, race, culture, religion, and customs of the "nation" in its primal sense of those who were "born" within its culture. This form of nationalism arose in reaction to dynastic or imperial hegemony, which assessed the legitimacy of the state from the "top down", emanating from a monarch or other authority, which justified its existence. Such downward-radiating power might ultimately derive from a god or gods (see the divine right of kings and the Mandate of Heaven).  - Josef Daniel Stenbäck (May 2, 1854, Alavus  April 27, 1929, Helsinki) was a Finnish church architect and engineer. He designed 35 churches for Finland, which until 1917 was part of the Russian Empire. Four of the churches were located in the current Russian territory of the Karelian Isthmus, ceded to the Soviet Union in 1944. Stenbäck's churches represent Romantic nationalism or Gothic Revival. One of his most famous works is the Juselius Mausoleum.  - Joensuu Church is located in the centre of Joensuu , North Karelia , Finland . The church was built in 1903 and designed by a Finnish church architect Josef Stenbäck . Architecturally it represents the Gothic Revival style , but it also has some features of National Romantic style . The high tower located in the northeast corner is the bell tower and in the lower southwest tower is the organ , which was built in 1969 by Organ Factory of Kangasala and has 36 stops . The church has 1000 seats . The altar painting is called The Crucifixion of Jesus and it is painted by Ilmari Launis in 1910 .  - Art Nouveau (Anglicised to ) is an international style of art, architecture and applied art, especially the decorative arts, that was most popular between 1890 and 1910. A reaction to the academic art of the 19th century, it was inspired by natural forms and structures, particularly the curved lines of plants and flowers.  - The National Romantic style was a Nordic architectural style that was part of the National Romantic movement during the late 19th and early 20th centuries. It is often considered to be a form of Art Nouveau.    'joensuu church' is related to which object entity through the relation of 'architectural style'?  Choices: - art nouveau  - national romantic style  - romantic nationalism
The answer is:
art nouveau