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# Which of the following elements is not used in micro alloys ?

$(a)\;\text{titanium} \\ (b)\;\text{Niobium} \\(c)\;\text{Vanadium} \\ (d)\;\text{Nickel}$

Micro alloys are the recently formed alloy steels in which steel is mixed with a very small proportion of elements like titanium, vanadium and niobium, to improve the micro properties of steel particularly the grain size.
Hence d is the correct answer.