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# The first use of quantum theory to explain the structure of atom was given by

$\begin{array}{1 1}(a)\;Heisenberg\qquad(b)\;Bohr\qquad(c)\;Planck\qquad(d)\;Einstein\end{array}$

Bohr made use of Planck's quantum of theory to propose his model for atom.
Hence (b) is the correct answer.