Question: Whitetop Mountain is the second-tallest mountain in Virginia behind which peak, near Troutdale?
Context: Whitetop is an unincorporated community in Grayson County, Virginia, United States.  It is the southern terminus of the Virginia Creeper Trail.  Whitetop is named for nearby Whitetop Mountain, the second-tallest independent mountain in the State of Virginia, behind Mount Rogers.  The town is about four miles northeast of the North Carolina–Tennessee–Virginia Corners. The White Top Folk Festival was a folk festival held on Whitetop Mountain in Grayson County, Virginia from 1931 to 1939.  Established by Annabel Morris Buchanan, John Blakemore, and classical musician John Powell, it featured Appalachian folk music.  At its height, the festival hosted First Lady Eleanor Roosevelt in 1933.  The festival was not held in 1937, and was canceled in 1940 due to flooding.  It did not resume again. Whitetop Mountain is the second highest independent mountain in the U.S. state of Virginia, after nearby Mount Rogers.  It is also the third highest named peak in Virginia, after Mount Rogers and its subsidiary peak, Pine Mountain.  It is located at the juncture of Grayson, Smyth, and Washington Counties, and is also within the Mount Rogers National Recreation Area of the Jefferson National Forest.  Whitetop was the location of the White Top Folk Festival from 1932 to 1939, with the exception of 1937.  Like nearby Mount Rogers, it represents an ecological "island" of flora and fauna commonly found much further north than Virginia, such as old growth red spruce and other northern softwoods. Càrn Eige, sometimes spelt Càrn Eighe, is a mountain in the north of Scotland.  At an elevation of 1183 m above sea level, it is the highest mountain in northern Scotland (north of the Great Glen), the twelfth-highest summit above sea level in the British Isles, and, in terms of relative height (topographic prominence), it is the second-tallest mountain in the British Isles after Ben Nevis (its "parent peak" for determination of topographic prominence).  The highpoint of the historic county of Ross and Cromarty, it is the twin summit of the massif, being mirrored by the 1181 m Mam Sodhail, to the south on the same ridge. Ripshin Farm, also known as the Sherwood Anderson Farm is a historic farm property at the junction of Routes 603 and 732 near Troutdale, Virginia.  It was developed as a summer home and later year-round home by writer Sherwood Anderson (1876-1941), and is where he wrote most of his later works.  It was declared a National Historic Landmark in 1971. Jirisan is a mountain located in the southern region of South Korea.  It is the second-tallest mountain in South Korea after Jeju Island's Hallasan, and the tallest mountain in mainland South Korea.  After Jirisan, Seoraksan is the third tallest mountain in South Korea and the second-tallest mountain on the South Korean mainland. Whitetop Mountain is a forested hill in the West-Central Interior of British Columbia, Canada.  It is on the northwest side of junction of the Chilcotin River and Downton Creek.  Whitetop is a volcanic cone of the Chilcotin Plateau and Anahim Volcanic Belt. Erymanthos (Greek: Ερύμανθος , Latin: "Erymanthus", also Olonos (Ωλονός)) is a mountain range in the southern part of Achaea and the northeastern part of Elis.  With an elevation of 2,224 meters, it is the fourth-tallest mountain in the Peloponnese peninsula.  The summit is located on the boundary of Achaea and Elis.  Historically, Mount Erymanthos was part of northwestern Arcadia, where it was the second-tallest mountain range.  The northern portion belonged to the historic Achaea. Mount Rogers is the highest natural point in the Commonwealth of Virginia, United States, with a summit elevation of 5729 ft above mean sea level.  The summit straddles the border of Grayson and Smyth Counties, Virginia, about 6.45 mi WSW of Troutdale, Virginia.  Most of the mountain is contained within the Lewis Fork Wilderness, while the entire area is part of the Mount Rogers National Recreation Area, which itself is a part of the Jefferson National Forest. Lewis and Clark State Recreation Site is a state park in eastern Multnomah County, Oregon, near Troutdale and Corbett, and is administered by the Oregon Parks and Recreation Department.  It is located on the Sandy River, near its confluence with the Columbia River.  Broughton's Bluff marks the westernmost extent of the Columbia River Gorge at the site.
Answer: Mount Rogers