Table:
text: 1950 Monaco Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine Tyre
Yves Giraud-Cabantous Automobiles Talbot-Darracq SA Talbot-Lago Talbot-Lago T26C Talbot L6 D
Pierre Levegh Private Talbot-Lago Talbot-Lago T26C Talbot L6 D
Cuth Harrison Private ERA ERA C ERA L6s D
Bob Gerard Private ERA ERA A ERA L6s D
Peter Whitehead Private Ferrari Ferrari 125 Ferrari V12s D
Giuseppe Farina SA Alfa Romeo Alfa Romeo Alfa Romeo 158 Alfa Romeo L8s P
Juan Manuel Fangio SA Alfa Romeo Alfa Romeo Alfa Romeo 158 Alfa Romeo L8s P
Luigi Fagioli SA Alfa Romeo Alfa Romeo Alfa Romeo 158 Alfa Romeo L8s P
Luigi Villoresi Scuderia Ferrari Ferrari Ferrari 125 Ferrari V12s P
Alberto Ascari Scuderia Ferrari Ferrari Ferrari 125 Ferrari V12s P

text: 1950 Monaco Grand Prix
Entries
Entries
Driver Entrant Constructor_ Chassis Engine Tyre
José Froilán González Scuderia Achille Varzi Maserati Maserati 4CLT-48 Maserati L4s P
Alfredo Piàn Scuderia Achille Varzi Maserati Maserati 4CLT-48 Maserati L4s P
Johnny Claes Ecurie Belge Talbot-Lago Talbot-Lago T26C Talbot L6 D
Harry Schell Horschell Racing Corporation Cooper Cooper T12 JAP V-twin D
Robert Manzon Equipe Gordini Simca-Gordini Simca Gordini T15 Gordini L4s E
Maurice Trintignant Equipe Gordini Simca-Gordini Simca Gordini T15 Gordini L4s E
Philippe Étancelin Private Talbot-Lago Talbot-Lago T26C Talbot L6 D
Louis Rosier Ecurie Rosier Talbot-Lago Talbot-Lago T26C Talbot L6 D
Charles Pozzi Ecurie Rosier Talbot-Lago Talbot-Lago T26C Talbot L6 D

Question: What is the competitor if the engine is a Talbot l6 and the driver is Pierre Levegh at the 1950 Monaco Grand Prix?

Question: What is the engine of the 1950 Monaco Grand Prix if the tire is d, the constructor is Era and the driver is Bob Gerard?