On which long U-shaped line of the Washington Metro transit system is Grosvenor-Strathmore station?
Grosvenor–Strathmore station: Grosvenor–Strathmore (formerly Grosvenor, pronounced /ˈɡroʊvnər/) is a rapid transit station on the Red Line of the Washington Metro in North Bethesda, Maryland. Red Line (Washington Metro): The Red Line of the Washington Metro rail rapid transit system serves 27 stations in Montgomery County, Maryland and the District of Columbia in the United States. Red Line (Washington Metro):  It forms a long, narrow "U", capped by its terminal stations at Shady Grove and Glenmont.
Red Line