Question: Who is the head of state of Germany who commanded the SM UC-25 minelaying submarine ?
Related documents: [0]  [DOC] SM "UC-25" was a German Type UC II minelaying submarine or U-boat in the German Imperial Navy (German: "Kaiserliche Marine" ) during World War I. The U-boat was ordered on 29 August 1915 and was launched on 10 June 1916. She was commissioned into the German Imperial Navy on 28 June 1916 as SM "UC-25". In 13 patrols "UC-25" was credited with sinking 21 ships, either by torpedo or by mines laid. March–September 1918 she was commanded by Karl Dönitz, later Grand admiral. "UC-25" was scuttled at Pola on 28 October 1918 on the surrender of Austria-Hungary. [END] 
[1]  [DOC] Karl Dönitz (sometimes spelt Doenitz) (] ; 16 September 1891 – 24 December 1980) was a German admiral who played a major role in the naval history of World War II. Dönitz briefly succeeded Adolf Hitler as the head of state of Germany. [END] 
Answer: 
Karl Dönitz
Karl Dönitz