Gold sol is a typical lyophobic colloid, so it is not a macromolecular colloid.
Its dispersed-phase particles are aggregates of many gold (
Au) atoms, making it a multimolecular colloid.
Gold sol particles also acquire a negative charge, so it is a negatively charged colloid.
Macromolecular colloids are formed by large individual molecules such as proteins or starch, which is not the case for gold sol.
Therefore, the correct choice is option A: Macromolecular colloid.