Information:  - Mercedes-Benz is a global automobile manufacturer and a division of the German company Daimler AG. The brand is known for luxury vehicles, buses, coaches, and trucks. The headquarters of Mercedes-Benz are in Stuttgart, Baden-Württemberg, Germany.  - Dr. Ing. h.c. F. Porsche AG, usually shortened to Porsche AG, is a German automobile manufacturer specializing in high-performance sports cars, SUVs and sedans. Porsche AG is headquartered in Stuttgart, and is owned by Volkswagen AG, which is itself majority-owned by Porsche Automobil Holding SE. Porsche's current lineup includes the 718 Boxster/Cayman, 911, Panamera, Macan and Cayenne.  - Karl Rabe ( 29 October 1895 , Pottendorf , Austria - 28 October 1968 ) was an automobile designer and was the Chief Designer at Porsche . He helped Ferdinand Porsche to develop the Porsche 's transmissions .  - Ferdinand Porsche (3 September 1875  30 January 1951) was an automotive engineer and founder of the Porsche car company. He is best known for creating the first gasoline-electric hybrid vehicle (Lohner-Porsche), the Volkswagen Beetle, the Mercedes-Benz SS/SSK, several other important developments and Porsche automobiles. In addition, Porsche designed the 1923 Benz Tropfenwagen, which was the first racing car with a mid-engine, rear-wheel drive layout.    Given the information above, choose from the list below the object entity that exhibits the relation 'occupation' with the subject 'karl rabe'.  Choices: - engineer  - manufacturer
The answer to this question is:
engineer