Concept:Certain respiratory diseases are caused by inhaling airborne irritants like dust and smoke.Explanation:When dust and smoke particles are inhaled, they can irritate and inflame the airways in the lungs, particularly the bronchi. This inflammation is known as bronchitis. Bronchitis leads to symptoms like coughing and difficulty breathing. The other options, gastritis, arthritis, and anaemia, are not directly caused by inhaling dust and smoke. Gastritis affects the stomach lining, arthritis affects joints, and anaemia is a blood disorder.Answer:B. Bronchitis