Given the task definition and input, reply with output. In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: Where was the person Filip worked with in Breslau educated? Passage:He was the son of a merchant, Adolf Abraham Eisenberg, and Ester nee Spiro. After finishing Sobieski Gymnasium in Krakow he studied medicine at the Jagiellonian University, where he obtained his PhD in medical studies in 1899. He then conducted postgraduate work in Vienna with Richard Paltauf and between 1901 and 1902 served as a research assistant to Odo Bujwid. Subsequently he worked in Paris, at the Pasteur Institute and then in Wrocaw (Breslau) under the direction of Richard Pfeiffer. Between 1919 and 1920 he was the head of a Military Hospital in Warsaw. In 1933 he became the director of the National Bacteriology Station in Krakow, a position he held until 1939. Until 1941 he was the head of the Institute of Medical Microbiology in Lwow (L'viv).
Links: a. Richard Friedrich Johannes Pfeiffer b. Odo Bujwid c. Jan III Sobieski High School, Krakow d. Vienna
a