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DH is a 51-year-old man who is a retired coal miner. He is diagnosed with COPD and is prescribed an inhaled medication that will provide him with immediate relief from acute bronchospasm. What is the major mechanism by which this drug works?
B2-adrenoceptor antagonist
B, -adrenoceptor antagonist
Muscarinic receptor antagonist
Leukotriene receptor antagonist