Increased asthmatic attacks in certain seasons are related to

Assertion $(A):$ $A$ person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.
Reason $(R):$ Due to low atmospheric pressure at high altitude,the body does not get sufficient oxygen.
In the light of the above statements,choose the correct answer from the options given below.

Which of the following is an occupational respiratory disease?

Which of the following can cause atelectasis?

Select the correct match of disease and its symptom.

Name the chronic respiratory disorder caused mainly by cigarette smoking in which alveolar walls are damaged.