Q: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
Passage: Universal could seldom afford its own stable of stars, and often borrowed talent from other studios, or hired freelance actors. In addition to Stewart and Dietrich, Margaret Sullavan, and Bing Crosby were two of the major names that made a couple of pictures for Universal during this period. Some stars came from radio, including Edgar Bergen, W. C. Fields, and the comedy team of Abbott and Costello (Bud Abbott and Lou Costello). Abbott and Costello's military comedy Buck Privates (1941) gave the former burlesque comedians a national and international profile.
A:
What entertainment medium did Edgar Fields and W.C. Bergen come from?