Cöln-class cruiser
Ships of the class

Name
Builder
Laid down
Launched
Completed
Fate
Cöln
Blohm & Voss
1915
5 October 1916
17 January 1918
Scuttled in Scapa Flow on 21 June 1919
Dresden
Howaldtswerke
1916
25 April 1917
28 March 1918
Scuttled in Scapa Flow on 21 June 1919
Wiesbaden
AG Vulcan
1915
3 March 1917
N/A
Not completed, scrapped in 1920
Magdeburg
Howaldtswerke
1916
17 November 1917
N/A
Not completed, scrapped in 1922
Leipzig
AG Weser
1915
28 January 1918
N/A
Not completed, scrapped in 1921
Rostock
AG Vulcan
1915
6 April 1918
N/A
Not completed, scrapped in 1921
Frauenlob
Kaiserliche Werft Kiel
1915
16 October 1918
N/A
Not completed, scrapped in 1921
Ersatz Cöln
AG Weser
1916
Not completed, scrapped in 1921
N/A
-
Ersatz Emden
AG Weser
1916
Not completed, scrapped in 1921
N/A
-
Ersatz Karlsruhe
Kaiserliche Werft Kiel
1916
Not completed, scrapped in 1920
N/A
-

Question: Which ships were completed?
Answer: Cöln and Dresden, the only two ships to be completed, were launched on 5 October 1916 and 25 April 1917, respectively.