Question: Who is the head of state of Germany who commanded the SM UC-25 minelaying submarine ?

full_context: Document 1: SM UC-29: SM "UC-29" 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 15 July 1916. She was commissioned into the German Imperial Navy on 15 August 1916 as SM "UC-29". In an eight-month career, the "UC-29" performed seven combat patrols into the Atlantic Ocean during the German war on Allied trade ("Handelskrieg"). In these patrols she was very successful, sinking 18 allied ships, totalling 21,903 tons. She also damaged 3 ships of 15,859 tons. On 7 June 1917 she torpedoed the British Q-ship  off the Irish coast, but was ambushed by her hidden armaments when she approached too close and was sunk with 23 hands. "Pargust" was commanded by British submarine hunter Gordon Campbell and had on board Ronald Niel Stuart and William Williams, who were awarded the Victoria Cross for their actions in the engagement.
Document 2: SM UC-42: SM "UC-42" 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 20 November 1915 and was launched on 21 September 1916. She was commissioned into the German Imperial Navy on 18 November 1916 as SM "UC-42".
Document 3: SM UC-25: 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.
Document 4: Interwar naval service of Erich Raeder: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany before and during World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health. Raeder is also well known for dismissing Reinhard Heydrich from the Reichsmarine in April 1931 for "conduct unbecoming to an officer and a gentleman".
Document 5: Karl Dönitz: 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.
Document 6: SM UC-24: SM "UC-24" 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 26 August 1915 and was launched on 4 March 1916. She was commissioned into the German Imperial Navy on 15 August 1916 as SM "UC-24". In four patrols "UC-24" was credited with sinking 4 ships, either by torpedo or by mines laid. "UC-24" was torpedoed and sunk by French submarine "Circé" off Cattaro on 24 May 1917.
Document 7: Erich Raeder resignation and later: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany before and during World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health.
Document 8: Erich Raeder pre Grand Admiral: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany before and during World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health. Raeder is also well known for dismissing Reinhard Heydrich from the Reichsmarine in April 1931 for "conduct unbecoming to an officer and a gentleman".
Document 9: Military career of Adolf Hitler: The military career of Adolf Hitler can be divided into two distinct portions of Adolf Hitler's life. Mainly, the period during World War I when Hitler served as a "Gefreiter" (lance corporal) in the Bavarian Army, and the era of World War II when Hitler served as the Supreme Commander-in-Chief of the Wehrmacht (German Armed Forces) through his position as Führer of Nazi Germany.
Document 10: Erich Raeder: Erich Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany who played a major role in the naval history of World War II. Raeder attained the highest possible naval rank—that of Grand Admiral — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health.
Document 11: SM UC-47: SM "UC-47" 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 20 November 1915, laid down on 1 February 1916, and was launched on 30 August 1916. She was commissioned into the German Imperial Navy on 13 October 1916 as SM "UC-47". In 13 patrols "UC-47" was credited with sinking 56 ships, either by torpedo or by mines laid. "UC-47" was rammed and depth charged by British patrol boat "P-57", under the command of H.C. Birnie, off Flamborough Head on 18 November 1917. "UC-47" went down with all hands.
Document 12: Flensburg Government: The Flensburg Government (German: "Flensburger Regierung" ), also known as the Flensburg Cabinet ("Flensburger Kabinett"), the Dönitz Government ("Regierung Dönitz"), or the Schwerin von Krosigk Cabinet ("Kabinett Schwerin von Krosigk"), was the short-lived government of Nazi Germany during a period of three weeks around the end of World War II in Europe. The government was formed following the suicide of Adolf Hitler on 30 April 1945 during the Battle of Berlin. It was headed by Grand Admiral Karl Dönitz as the Reichspräsident and Lutz Graf Schwerin von Krosigk as the Leading Minister.
Document 13: SM UC-39: SM "UC-39" 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 20 November 1915 and was launched on 25 June 1916. She was commissioned into the German Imperial Navy on 31 October 1916 as SM "UC-39". In one patrols "UC-39" was credited with sinking 3 ships, either by torpedo or by mines laid. "UC-39" was forced to the surface by a depth charge attack and then sunk by gunfire from the British destroyer "Thrasher" off Flamborough Head on 8 February 1917.
Document 14: SM UC-62: SM "UC-62" 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 12 January 1916, laid down on 3 April 1916, and was launched on 9 December 1916. She was commissioned into the German Imperial Navy on 8 January 1917 as SM "UC-62". In nine patrols "UC-62" was credited with sinking 12 ships, either by torpedo or by mines laid. On 19 March 1917, the submerged Royal Navy submarine  suffered damage in a collision "UC-62" in the North Sea off the North Hinder Light Vessel. "UC-62" struck a mine and sank in the North Sea off Zeebrugge, Belgium, on 14 October 1917.
Document 15: Erich Raeder during World War II: Erich Johann Albert Raeder (24 April 1876 – 6 November 1960) was a naval leader in Germany who played a major role in the Naval history of World War II. Raeder attained the highest possible naval rank—that of "Großadmiral" (Grand Admiral) — in 1939, becoming the first person to hold that rank since Alfred von Tirpitz. Raeder led the "Kriegsmarine" (German War Navy) for the first half of the war; he resigned in 1943 and was replaced by Karl Dönitz. He was sentenced to life in prison at the Nuremberg Trials, but was released early due to failing health. Raeder is also well known for dismissing Reinhard Heydrich from the Reichsmarine in April 1931 for "conduct unbecoming to an officer and a gentleman".
ground_truth: Karl Dönitz