'Asthma' is caused by

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(D) Asthma is a chronic respiratory condition characterized by inflammation and narrowing of the airways.It is primarily caused by a spasm or contract

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Spasm in bronchial muscles

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(D) Asthma is a chronic respiratory condition characterized by inflammation and narrowing of the airways.It is primarily caused by a spasm or contraction of the smooth muscles surrounding the bronchi and bronchioles (bronchial muscles).This constriction,often triggered by allergens or irritants,makes it difficult for air to flow in and out of the lungs,leading to symptoms like wheezing,shortness of breath,and coughing.

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