Output a stream of consciousness before answering the following. Passage: The flag of Argentina is a triband, composed of three equally wide horizontal bands coloured baby blue and white. There are multiple interpretations on the reasons for those colors. The flag was created by Manuel Belgrano, in line with the creation of the Cockade of Argentina, and was first raised at the city of Rosario on February 27, 1812, during the Argentine War of Independence. The National Flag Memorial was later built on the site. The First Triumvirate did not approve the use of the flag, but the Asamblea del Ano XIII allowed the use of the flag as a war flag. It was the Congress of Tucuman which finally designated it as the national flag, in 1816. A yellow Sun of May was added to the center in 1818.

Question: Based on this passage, which flag has a sun in the middle?
The relevant information is: A yellow Sun of May was added to the center in 1818.
The answer: flag of Argentina.