What does a consensual response of the pupils indicate?

A consensual response of the pupils indicates that both pupils react equally to light stimulation. When light is shined into one pupil, the normal response is for that pupil to constrict as well as for the opposite pupil to constrict at the same time, regardless of whether it is directly exposed to the light. This phenomenon is due to the neural pathways that connect the two pupils through the brain, specifically involving the optic nerve and the parasympathetic pathways controlling pupillary constriction.

This coordinated response helps assess the integrity of both the sensory and motor pathways involved in the pupillary reflex. If there is equal reaction of both pupils when light is applied to either side, it suggests that the neural connections are functioning properly. Hence, the correct answer reflects a healthy and normal pupillary response during examination.