Which statement is true regarding asthma? A) There is decreased responsiveness to environmental stimuli.
B) It is characterized by airway inflammation.
C) It involves irreversible airway obstruction.
D) Extrinsic asthma has adult onset.

The correct answer is B.

Explanation:

Asthma is a chronic inflammation of the airway, it consists of inflammation of the bronchi, which are responsible for bringing air to the lungs, producing an obstruction of these, which deals with recurring episodes of bronchial hyperresponsiveness and a variable obstruction to air flow. All these inflammatory changes can happen abruptly (Acute Asthma) or slowly and continuously (Chronic Asthma). When they appear abruptly it is called "crisis" or acute asthmatic attack. Both the acute and chronic forms can be highly variable in terms of intensity or duration; sometimes they yield alone or with special treatments.

is there answer choices?