# Mortar is mixture of

$\begin{array}{1 1}(a)\;Plaster\;of\; POP(Plaster\; of\; Paris)\\(b)\;Slaked\;lime+Plaster\; of \;Paris\\(c)\;CaCO_3+silica+H_2O\\(d)\;Cement+silica+H_2O\end{array}$

Mortar is mixture of cement+silica+$H_2O$
Hence (d) is the correct answer.