<prompt> Which of the following drug combination is supraadditiveNitrous oxide halothane as general anaestheticGlibenclamide metformin as hypoglycaemicSulfamethoxazole trimethoprimEphedrine theophylline as bronchodilator  <response>: Additive: Effect of drug A B effect of drug A effect of drug B Aspirin paracetamol as analgesic antipyretic Nitrous oxide halothane as general anaesthetic Amlodipine atenolol as antihypeensive Glibenclamide metformin as hypoglycaemic Ephedrine theophylline as bronchodilator Supra additive : Effect of drug A B effect of drug A effect of drug B Acetylcholine Physostigmine Inhibition of break down Levodopa carbidopa Inhibition of peripheral metabolism benserazide Adrenaline cocaine desipramine Inhibition of neuronal uptake Sulfamethoxazole trimethoprim Sequential blockade Antihypeensives enalapril hydrochlorothiazide: Tackling two contributoryfactors 