In the following question, a part of the sentence may have an error. Find out which part of the sentence has an error and choose the appropriate option. If the sentence does not have any error choose option 4 'No error' as the answer. Otto Hahn is considered a pioneer of (1)/ radioactivity and radiochemistry for the (2)/ discovery of nuclear fission in 1938. (3)/ No error (4)
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