Question: Pennsylvania Route 436 has a southern terminus at the route that is a spur of what other US route?
Context: Pennsylvania Route 858 (designated by the Pennsylvania Department of Transportation as SR 0858) is a 16.465 mi state highway located in Susquehanna County in Pennsylvania.  The southern terminus is at PA 706 in Rush Township.  The northern terminus is the New York state line in Little Meadows.  The route from there continues as Tioga County Route 41.  The route was assigned in 1928, completed a year later, and has remained the same since, with an exception of its southern terminus changing designations from Pennsylvania Route 67. Pennsylvania Route 550 (PA 550) is a 36 mile (58 km) long state highway in Pennsylvania.  The southern terminus of the route is at Pennsylvania Route 45 Truck and Pennsylvania Route 453 east of Tyrone.  The northern terminus is at Pennsylvania Route 64 in Zion. Pennsylvania Route 978, also known as PA 978, is a 9.7 mi north–south state highway located in western Allegheny County, Pennsylvania.  The southern terminus of the route is at Pennsylvania Route 50 in the vicinity of the Cecil area (of Washington County, although the road remains in Allegheny County) and of the Gladden area.  The highway heads slightly to the northwest, and reaches the northern terminus at the intersection of US Route 22 and US Route 30 in the Imperial-Enlow area.  (A few other names for US 22 and 30 here are William Penn Highway, Lincoln Highway, and Penn-Lincoln Parkway [here not part of I-376].) Pennsylvania Route 436 (PA 436) is a 1.969 mi state highway located in Jefferson county in Pennsylvania.  The southern terminus is at US 119 near Punxsutawney.  The northern terminus is at PA 36 in Punxsutawney.  PA 436 was assigned in the 1928 numbering of roads in Pennsylvania and not paved until 1932.  The road's other lone major intersection on PA 436 is for Jefferson SR 3012.  The route is highly elevated for most of its length, reaching as high as 1500 ft . Pennsylvania Route 472 (PA 472) is a north–south state highway in Chester and Lancaster counties in Pennsylvania.  Its southern terminus is at PA 841 in Lewisville 300 yd north of the Maryland border.  Its northern terminus is at PA 372 in Quarryville.  PA 472 is a two-lane undivided road that passes through mostly rural areas along a northwest-southeast alignment.  The route passes through the borough of Oxford, where it intersects the southern terminus of PA 10 and has an interchange with U.S. Route 1 (US 1).  PA 472 was originally designated in 1928 between US 1/PA 12/PA 42 in Oxford and PA 372 in Quarryville.  The route was extended south to Hickory Hill by 1930, at which time the entire length of the route was paved.  The southern terminus of PA 472 was extended to PA 841 in Lewisville in 1937. Pennsylvania Route 89 (PA 89) is a 50 mi north–south state highway located in northwestern Pennsylvania.  The southern terminus of the route is at Pennsylvania Route 8 and Pennsylvania Route 27 in Titusville.  The northern terminus is at Pennsylvania Route 5 north of North East. Pennsylvania Route 837 (PA 837) is a state route located in western Pennsylvania.  The southern terminus of the route is at Pennsylvania Route 88 in the Carroll Township hamlet of Wickerham Manor.  The northern terminus is at U.S. Route 19 and Pennsylvania Route 51 in downtown Pittsburgh at the junction of the Ohio, Allegheny and Monongahela rivers.  The highway parallels the Monongahela River for all of its route with the exceptions of its extreme north and south ends.  Popular amusement park Kennywood is located along this route. Pennsylvania Route 170 (designated by the Pennsylvania Department of Transportation as SR 170) is an 11.65 mi state highway located in Wayne County in Pennsylvania.  The southern terminus is at U.S. Route 6 in Prompton.  The northern terminus is at Route 670 near Mount Pleasant Township.  The route was designated in 1928 by the Pennsylvania Department of Highways as a spur of Route 70, although did not intersect with Route 70.  Route 70 was renumbered in 1961 to Route 171.  It is currently one of three remaining spurs of Route 70, including Route 370 and Route 670. U.S. Route 119, commonly abbreviated as US 119, is a spur of US 19.  It is a north–south route that was an original United States highway of 1926.  It is often referred to as Corridor G east of US 23 and KY 80 in Kentucky to Interstate 64 at Charleston, West Virginia. U.S. Route 222 Business (US 222 Bus.)  is a 12.17 mi business route of US 222 located in Reading, Pennsylvania.  The southern terminus is at US 222 in Cumru Township.  Its northern terminus is at US 222 in Ontelaunee Township.  The route begins at the US 222 freeway and heads through the southwestern suburbs of Reading as Lancaster Avenue, intersecting Pennsylvania Route 724 (PA 724) in Shillington.  US 222 Bus.  continues into Reading on Lancaster Avenue and intersects the northern termini of PA 625 and PA 10 before reaching an interchange with the US 422 freeway.  The business route crosses the Schuylkill River and becomes Bingaman Street.  US 222 Bus.  turns north on 5th Street and intersects US 422 Bus.  in downtown Reading and the southern terminus of PA 61 to the north of downtown.  The route interchanges with the PA 12 freeway and continues north through suburban Muhlenberg Township as 5th Street Highway.  US 222 Bus.  reaches Temple and continues northeast to its northern terminus as Allentown Pike.  US 222 Bus.  is the only auxiliary route of US 222 in Pennsylvania.
Answer: US 19