Definition: In this task, you're given a question, along with a context passage which has extra information available on certain terms mentioned in it. Your job is to determine which sentence(s) from the passage can be used to search for further information needed to answer the question.
Input: Question: Who served as the second president of the trade union that Hugo Graf helped found? Passage:After the war ended in May 1945 Graf returned home in August 1946. Home was now in the Soviet occupation zone of what remained of Germany. During the next few years, under Soviet Military Administration, the region would become the Soviet sponsored German Democratic Republic, formally founded in October 1949, but in reality the creation of the new state was an iterative process. Already in April 1946, the merging of the old Communist Party (KPD) and more moderately left wing SPD into the new SED created the basis for a return to one-party government. Hugo Graf arrived back as a long-standing member of the Communist Party, now no longer illegal in Germany, and like thousands of others, lost no time in signing over his membership to the new Socialist Unity Party of Germany (SED / Sozialistische Einheitspartei Deutschlands). In 1946 he became a spokesman/consultant of the health department of the Central Secretariat with the interim administration, having become a department head by 1948. He was one of the founders of the Health Service of the Trade Union Federation (FDGB / Freier Deutscher Gewerkschaftsbund), and on 5 July 1949 he was appointed its first president, serving in this position till 1951.

Output:
He was one of the founders of the Health Service of the Trade Union Federation (FDGB / Freier Deutscher Gewerkschaftsbund), and on 5 July 1949 he was appointed its first president, serving in this position till 1951