user: Question: What was the engine driven by Jean-Pierre Jarier and has a chassis of PC4?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Engine', 'Tyres', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Marlboro Team McLaren', 'McLaren - Ford', 'M23 M26', 'Ford Cosworth DFV 3.0 V8', 'G', 'James Hunt', 'All']
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Driver" = 'Jean-Pierre Jarier' AND "Chassis" = 'PC4';