When suffering from a respiratory allergy it is advisable to...

A)travel at dawn.
B)drive with the windows open.
C)follow the treatment and advice of your doctor.Correct
If medication needs to be taken, it will be necessary to find out, either through the doctor, pharmacist or the medication's own leaflet, about any possible contraindications for driving.
Antihistamines, which are used to relieve allergy symptoms, can cause significant drowsiness. The most modern ones, of the 3rd generation, are safer than those of the 1st generation, but we should never mix them with alcohol or other medications.