In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.
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Question: who discovered the magnetic effect of electric current

Answer: Hans Christian Ørsted


Question: when did robben island became a world heritage site

Answer: 1999


Question: when did delhi became the capital of british india

Answer:
1911