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What is Which of the following term best describes the antagonism of bronchoconstrictor eﬀect (mediated at the leukotriene receptors)of  leukotrienes by terbutaline  (acting at the adrenoceptors) in a patient with asthma? and explain in detail?
Physiological / functional antagonism
The two drugs act on different receptors or by different mechanisms, but have opposite overt effects on the same physiological function. i.e. have pharmacological effects in opposite direction, e.g.

Histamine and adrenaline on bronchial muscles and on BP.
Hydrochlorothiazide and amiloride on urinary K+ excretion.
Glucagon and insulin on blood sugar level.

Key Concept: 
Drugs producing opposite action by acting on diﬀerent receptors are called physiological antagonists.
Reference: Essentials of Medical Pharmacology Eighth Edition KD TRIPATHI page no 68