Remember the difference in the middle word.
C stands for Christlich, S for Soziale and U for Union. The official spelling includes a hyphen between Christlich and Soziale. The existing test answer is retained unchanged.
CDU and CSU have separate organisational names. Their MPs work together in a joint Bundestag group, explaining the common form CDU/CSU.

The other three answers
All incorrect answers change the fixed name.
Christian Secure Union
S does not stand for Sichere, meaning secure. The word is Soziale.
Christian South German Union
Süddeutsche, meaning South German, may sound geographically plausible but is not the S in the party name.
Christian Social Entrepreneurs' Association
CSU is not an abbreviation for an entrepreneurs' association. U stands for Union.
Learn name, region and parliamentary group separately.
The full name includes “in Bayern e.V.”. The test asks for the familiar abbreviation, not every element of the association's legal name.
This neutral vocabulary explanation assesses neither the party programme nor individual members. A similar abbreviation also does not automatically mean an identical political position.
Section 2 · Name and seat · CSU · Statutes ↗CSU: S for Soziale. CDU: D for Demokratische.
The joint group connects two distinct parties.
Three words for this question
- sozialsocial
- The base word for Soziale in the fixed party name.
- der Bindestrichhyphen
- The mark joining the two words in Christlich-Soziale.
- die Fraktionsgemeinschaftjoint parliamentary group
- A joint parliamentary organisation of MPs from distinct parties under the applicable rules.
