What profession did Oliver Tambo practice before entering politics?

Oliver Tambo practiced as a lawyer before entering politics. He studied at the University of Fort Hare, where he earned a degree in mathematics and science, but later went on to study law at the University of London's Inner Temple. His legal training provided him with a strong foundation in advocacy, which he utilized in his political career, especially in the anti-apartheid struggle. Tambo's background as a lawyer shaped his approach to activism, as he effectively used legal principles to challenge injustices and mobilize support for the African National Congress (ANC) and its goals. This legal expertise distinguished him as a significant figure in the fight against apartheid, highlighting the importance of having legal knowledge in political activism.

Other options such as teacher, doctor, and engineer do not reflect Tambo's professional journey as accurately as the choice of lawyer does. While he may have had versatile interests and skills, his primary and notable profession before embarking on his political career was indeed in law.