Question: The Missouri river has a tributary that originates from what peak in the Absaroka Range?
Context: Index Peak, el.  10709 ft , is a prominent mountain peak in the Absaroka Range in Park County, Wyoming.  The peak is visible from US Route 212, the Beartooth Highway just east of the Northeast Entrance Station to Yellowstone National Park.  Pilot Peak rises just south of Index Peak. Fishhawk Glacier is located in the Absaroka Range, Shoshone National Forest, in the U.S. state of Wyoming.  The glacier is situated on the northeast slope of Overlook Mountain (11869 ft ) and is one of but a few glaciers that can be found in the Absaroka Range. Druid Peak (elevation 9577 ft ) is a moderate domed peak on the southern flank of the Absaroka Range in Yellowstone National Park.  The peak lies just north of the Lamar River and Soda Butte Creek confluence at the head of the Lamar Valley.  Prior to 1885, this summit was named "Soda Hill" by members of the Hayden Geological Survey of 1878 and "Mount Longfellow" or "Longfellows' Peak" by then park superintendent Philetus Norris in 1880.  In 1885, members of the Arnold Hague Geological Survey changed the name to Druid Peak for unknown reasons, but some historians believe it may have been the presence of Stonehenge like rock formations on its eastern face that prompted the name. DuNoir Glacier is located in the Absaroka Range, Shoshone National Forest, in the U.S. state of Wyoming.  The glacier is situated on the northeast slope of Coffin Butte (11317 ft ) and is one of but a few glaciers that can be found in the Absaroka Range. Younts Peak is a peak in the Absaroka Range in northwestern Wyoming in the United States and the highest point in the Teton Wilderness.  The Yellowstone River is formed near the peak from two streams that rise on the northern and southern ridges of the peak and join at the base of the western ridge.  The peak summit itself can be hiked, but accessing the peak is difficult due to its remoteness.  The peak was named after Harry Yount, a hunter and guide considered to be the first ranger in Yellowstone National Park. Mount Schurz el.  11007 ft is a mountain peak in the Absaroka Range in Yellowstone National Park.  Mount Schurz is the second highest peak in Yellowstone.  The mountain was originally named Mount Doane by Henry D. Washburn during the Washburn–Langford–Doane Expedition in 1871.  Later the name Mount Doane was given to another peak in the Absaroka Range by geologist Arnold Hague.  In 1885, Hague named the mountain for the 13th U.S. Secretary of the Interior, Carl Schurz (1877–1881).  Schurz was the first Secretary of the Interior to visit Yellowstone and a strong supporter of the national park movement. The Yellowstone River is a tributary of the Missouri River, approximately 692 mi long, in the western United States.  Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National Park across the mountains and high plains of southern Montana and northern Wyoming. Colter Peak el.  10640 ft is a mountain peak in the Absaroka Range in the southeastern section of Yellowstone National Park.  The peak is named for mountain man John Colter, reputedly the first white man to visit the Yellowstone region.  Colter Peak was first ascended in 1870 by Lt. Gustavus Cheyney Doane and Nathaniel P. Langford during the Washburn–Langford–Doane Expedition.  Henry D. Washburn, the expedition leader named the peak for Langford and Doane.  For unknown reasons, geologist Ferdinand V. Hayden moved those names to peaks farther north in 1871 during the Hayden Geological Survey of 1871.  In 1888, Philetus Norris the second park superintendent, named the peak "Mount Forum" for unknown reasons.  In 1885, geologist Arnold Hague gave the peak its official name: Colter Peak. Washakie Needles (12523 ft ) is the highest peak in the Washakie Range in the U.S. state of Wyoming.  Washakie Needles is in the Washakie Wilderness of Shoshone National Forest.  The Washakie Range is one of the southern group of mountains within the Absaroka Range, the other being the Owl Creek Mountains.  Washakie Needles is only .8 mi south of the slightly lower Dome Mountain, the second tallest peak in the Washakie Range.  Part of the Absaroka volcanic field, the dacites that comprise the summit needles or pillars on Washakie Needles have been dated at 38.8 million years old, and are the youngest volcanic rocks associated with the Absarokas. The Absaroka Range ( or ) is a sub-range of the Rocky Mountains in the United States.  The range stretches about 150 mi (240 km) across the Montana-Wyoming border, and 75 miles at its widest, forming the eastern boundary of Yellowstone National Park along Paradise Valley (Montana), and the western side of the Bighorn Basin.  The range borders the Beartooth Mountains to the north and the Wind River Range to the south.  The northern edge of the range rests along I-90 and Livingston, Montana.  The highest peak in the range is Francs Peak, located in Wyoming at 13153 ft .  There are 46 other peaks over 12000 ft .
Answer: Yellowstone River