Q.  Which among the following is the correct way to administer nitroglycerine for chest pain?

(a) One tablet or spray every 3 minutes, up to 5 minutes, then drive yourself to the ER 
(b) Take as many tablets or sprays as necessary to relieve pain, if the patient persists, it is probably not your heart
(c) One tablet or spray every 5 minutes, up to 3 times; call 101 or 112 if then pain is not completely relieved
(d)Take one tablet or spray and cause the heart clinic