Asthma is a respiratory disease caused due to:

Bleeding into pleural cavity

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Spasm in bronchial muscles

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Infection of trachea

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Infection of lungs

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Solution

The correct option is B Spasm in bronchial muscles
Asthma is caused due to inflammation of lungs and spasm in bronchial muscles. The symptoms of the disease are coughing, chest tightness, and shortness of breath. It is mainly caused due to environmental and genetic factors.

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