Problem: Please answer a question about the following article about Nanjing:
Nanjing is one of the most beautiful cities of mainland China with lush green parks, natural scenic lakes, small mountains, historical buildings and monuments, relics and much more, which attracts thousands of tourists every year.
Nanjing is considered one of the most pretty cities in what region?
A: mainland China

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As a doctoral student at Germany's University of Erlangen-Nuremberg, Karlheinz Brandenburg began working on digital music compression in the early 1980s, focusing on how people perceive music. He completed his doctoral work in 1989. MP3 is directly descended from OCF and PXFM, representing the outcome of the collaboration of Brandenburgworking as a postdoc at AT&T-Bell Labs with James D. Johnston ("JJ") of AT&T-Bell Labswith the Fraunhofer Institut for Integrated Circuits, Erlangen, with relatively minor contributions from the MP2 branch of psychoacoustic sub-band coders. In 1990, Brandenburg became an assistant professor at Erlangen-Nuremberg. While there, he continued to work on music compression with scientists at the Fraunhofer Society (in 1993 he joined the staff of the Fraunhofer Institute).

When did Brandenburg join the Fraunhofen Institute?
Answer: 1993

Problem: In 334 BC, Alexander the Great invaded the Achaemenid Empire, defeating the last Achaemenid emperor, Darius III, at the Battle of Issus. Following the premature death of Alexander, Iran came under the control of the Hellenistic Seleucid Empire. In the middle of the 2nd century BC, the Parthian Empire rose to become the main power in Iran, and the century-long geopolitical arch-rivalry between Romans and Parthians began, culminating in the RomanParthian Wars. The Parthian Empire continued as a feudal monarchy for nearly five centuries, until 224 CE, when it was succeeded by the Sassanid Empire. Together with their neighboring arch-rival, the Roman-Byzantines, they made up the world's two most dominant powers at the time, for over four centuries.
When did the Sassanid Empire succeed the Parthian Empire in control of Iran?
The answer is the following: 224 CE

The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System (simplified Chinese: ; traditional Chinese: ; pinyin: Beidou weixing daohang shiyan xitong) and also known as BeiDou-1, consists of three satellites and offers limited coverage and applications. It has been offering navigation services, mainly for customers in China and neighboring regions, since 2000.
Who does the BeiDou-1 operate for?
mainly for customers in China and neighboring regions

Input: Dwight D. Eisenhower
After the Soviet Union launched the world's first artificial satellite in 1957, Eisenhower authorized the establishment of NASA, which led to the space race. During the Suez Crisis of 1956, Eisenhower condemned the Israeli, British and French invasion of Egypt, and forced them to withdraw. He also condemned the Soviet invasion during the Hungarian Revolution of 1956 but took no action. In 1958, Eisenhower sent 15,000 U.S. troops to Lebanon to prevent the pro-Western government from falling to a Nasser-inspired revolution. Near the end of his term, his efforts to set up a summit meeting with the Soviets collapsed because of the U-2 incident. In his January 17, 1961 farewell address to the nation, Eisenhower expressed his concerns about the dangers of massive military spending, particularly deficit spending and government contracts to private military manufacturers, and coined the term "militaryindustrial complex".

Along with Israel, what countries' armies invaded Egypt in 1956?
Output: British and French

Problem: Please answer a question about the following article about List of numbered streets in Manhattan:
14th Street is a main numbered street in Manhattan. It begins at Avenue C and ends at West Street. Its length is 3.4 km (2.1 mi). It has six subway stations:
How many subway stations are on 14th Street?
A:
six