Which acid and base combine to form 'common salt'?

Common salt is sodium chloride ($\mathrm{NaCl}$). It is a neutral salt, thus it is obtained by the reaction of a strong acid ($\mathrm{HCl}$) and a strong base ($\mathrm{NaOH}$).

$\mathrm{HCl} \left(\mathrm{aq}\right) + \mathrm{NaOH} \left(\mathrm{aq}\right) \to \mathrm{NaCl} \left(\mathrm{aq}\right) + {\mathrm{H}}_2\mathrm{O} \left(\mathrm{l}\right)$

Thus, the correct answer is-Hydrochloric acid and Sodium hydroxide.