Answer:
The correct answer is - rebound congestion.
Explanation:
Rebound congestion is the condition where an individual client experiences severe nasal congestion which is the worsening of the original congestion due to the overuse or dependence of the OTC medication for a longer period so blood vessels constricted.
In this case, the client report indicates the rebound congestion due to his/her dependency on the OTC nasal spray that results in worsening the condition of the congestion.
Thus, the correct answer is - rebound congestion.