In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.
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Question: What episode of supergirl does she meet the flash?

Answer: Worlds Finest


Question: How many years congress ruled india after independence?

Answer: more than 54 years


Question: Operating system developed in 1969 at at&t's bell laboratories?

Answer:
Unics