Which of the following material has been identified recently by scientist as worlds most heat resistant material?

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Q: 47 (Current Affairs-DEC/2016)

Which of the following material has been identified recently by scientist as world’s most heat resistant material?

question_subject: 

Science

stats: 

0,65,84,17,20,65,47

keywords: 

{'most heat': [0, 0, 0, 1], 'magnesium carbide': [0, 0, 0, 1], 'hafnium carbide': [0, 0, 0, 1], 'calcium carbide': [0, 0, 1, 2], 'resistant material': [0, 0, 0, 1], 'material': [0, 0, 0, 1], 'tantunum oxide': [0, 0, 0, 1]}