23. Asthma is caused due to A.Infection of trachea B.Infection of lung C.Bleeding into pleural cavity D.Spasm in bronchial muscles
Answer: Option D Solution: Asthma is caused due to inflammation of lungs and spasm in bronchial muscles. The peculiar symptoms of the disease are coughing, chest tightness, and shortness of breath. It is mainly caused due to environmental and genetic factor.
