Predict the correct intermediate and product in the following reaction
$$\begin{gathered} {\mathrm{H}}_3\mathrm{C}-\mathrm{C}\equiv \mathrm{CH}\underset{{\mathrm{HgSO}}_4}{\overset{{\mathrm{H}}_2\mathrm{O},{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\mathrm{Intermediate}\to \underset{\left(\mathrm{B}\right)}{\mathrm{Product}} \\ \left(\mathrm{A}\right) \end{gathered}$$