Which one of the following pairs is not correctly matched ?

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Q: 71 (UPPSC/2011)

Which one of the following pairs is not correctly matched ?

question_subject: 

Geography

question_exam: 

UPPSC

stats: 

0,7,9,1,4,4,7

keywords: 

{'kimberley': [0, 0, 0, 1], 'diamond': [0, 0, 3, 3], 'iron ore': [4, 0, 2, 5], 'copper': [1, 0, 1, 1], 'gold': [8, 1, 7, 14], 'witwatersrand': [0, 0, 0, 1]}