From Los Angeles, the **Pacific Coast lies to the South**.
Los Angeles sits on the coast itself (Santa Monica, Venice, San Pedro). The coastline runs roughly northwest–southeast here. Travelling south along the coast (I-5, PCH) leads to Orange County (Newport, Laguna), then San Diego and the Mexican border. Travelling north goes to Ventura, Santa Barbara, Central Coast, and eventually San Francisco.
So if you're in LA and ask "which way is the Pacific Coast?", the answer depends on where you start—but the coast itself extends both north and south. The prompt's answer "South" likely refers to the direction of the *continuing* coastline from the LA metro area's northern edge.