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EasyRespiratoryPersistent asthma in adultsca-mccqe1ca-ccfpca-rcpsc-im

A 29-year-old man presents with episodic wheeze, chest tightness and cough worse at night and with exercise. Spirometry shows FEV1 70% predicted with 15% and 250 mL improvement after Salbutamol. Which is the most appropriate initial controller treatment?

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