Passage: A talented young woman, Faulstich quickly advanced in her career – from graduate assistant to technician, then to scientific assistant, and finally to scientist. Her fiancé died in the Second World War, and from then on, she focused only on her career. In 1942 she studied chemistry while continuing to work at Schott. She could not finish her studies because the situation changed after the Second World War. Jena belonged to the Soviet occupation zone; however, the most advanced glassmaking facility in the world was located in Jena and the Western Allies wanted to obtain and use this know-how. Therefore, 41 specialists and managers of Schott AG were brought to the western sector, including Marga Faulstich.

Question: What did Jena belong to?
the Soviet occupation zone