In which of the following countries mineral oil was economically drilled in 1857 ?

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Q: 68 (RAS/2013)
In which of the following countries mineral oil was economically drilled in 1857 ?
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question_subject: 

Geography

question_exam: 

RAS

stats: 

0,5,49,18,23,8,5

keywords: 

{'countries mineral oil': [0, 0, 0, 1], 'venezuela': [0, 0, 0, 1], 'indonesia': [1, 0, 1, 0], 'romania': [1, 0, 9, 3]}