im building an expert system with SWI-Prolog and it deal with disease/diagnostic

%flu

sympton(flu,cough).

sympton(flu,sneeze).

sympton(flu,stomach_ach).

%hangover

sympton(hangover,cough).

sympton(hangover,feeling_dizzy).

sympton(hangover,stomach_ach).

how would you make so that when ask for symptons like this

sympton:cough?yes.

sympton:sneeze?no.

sympton:cough? yes.

but you already answer yes how would you make it so that question doesnt repeat itself to me it seem like it backtracking but i dont want it to do that