Question: What is the abbreviation for Angela Merkel's original home country that once had border troops called the Deutsche Grenzpolizei?

Passages:
The Sun has been openly antagonistic towards other European nations, particularly the French and Germans. During the 1980s and 1990s, the nationalities were routinely described in copy and headlines as "frogs", "krauts" or "hun". As the paper is opposed to the EU it has referred to foreign leaders who it deemed hostile to the UK in unflattering terms. Former President Jacques Chirac of France, for instance, was branded "le Worm". An unflattering picture of German chancellor Angela Merkel, taken from the rear, bore the headline "I'm Big in the Bumdestag" (17 April 2006). Merkel was born in Hamburg in then-West Germany and moved to East Germany as an infant when her father, a Lutheran clergyman, received a pastorate in Perleberg. She obtained a doctorate in quantum chemistry in 1986 and worked as a research scientist until 1989. Merkel entered politics in the wake of the Revolutions of 1989, and briefly served as a deputy spokesperson for the first democratically elected East German Government headed by Lothar de Maizière in 1990. Following German reunification in 1990, Merkel was elected to the Bundestag for the state of Mecklenburg-Vorpommern, and has been reelected ever since. As the protégée of Chancellor Helmut Kohl, Merkel was appointed as the Federal Minister for Women and Youth in Kohl's government in 1991, and became the Federal Minister for the Environment, Nature Conservation and Nuclear Safety in 1994. After her party lost the federal election in 1998, Merkel was elected Secretary-General of the CDU before becoming the party's first female leader two years later in the aftermath of a donations scandal that toppled Wolfgang Schäuble. East German literature is the literature produced in East Germany from the time of the Soviet occupation in 1945 until the end of the communist government in 1990. The literature of this period was heavily influenced by the concepts of socialist realism and controlled by the communist government. As a result, the literature of the German Democratic Republic (East Germany) was for decades dismissed as nothing more than "Boy meet Tractor literature", but its study is now considered a legitimate field. Because of its language, the literature is more accessible to western scholars and is considered to be one of the most reliable, if not the most reliable, sources about East Germany. Heinz-Josef Große was a 34-year-old East German (GDR) construction worker who was shot and killed on 29 March 1982 by GDR border guards on the Inner German border at Schifflersgrund, near Bad Sooden-Allendorf.

Supporting sentences:
Merkel was born in Hamburg in then-West Germany and moved to East Germany as an infant when her father, a Lutheran clergyman, received a pastorate in Perleberg. As a result, the literature of the German Democratic Republic (East Germany) was for decades dismissed as nothing more than "Boy meet Tractor literature", but its study is now considered a legitimate field. Heinz-Josef Große was a 34-year-old East German (GDR) construction worker who was shot and killed on 29 March 1982 by GDR border guards on the Inner German border at Schifflersgrund, near Bad Sooden-Allendorf.