Black lung disease is common among

In this disease,the respiratory surface area decreases.

Altitude sickness is managed by the body by

Which of the following is an occupational respiratory disease?

Match the names of diseases listed under Column $I$ with their meanings given under Column $II$,and choose the answer that provides the correct combination.

Column $I$ (Name of disease)	Column $II$ (Meanings)
$(A)$ Jaundice	$(p)$ Allergic inflammation of nose
$(B)$ Stenosis	$(q)$ Loss of motor functions
$(C)$ Rhinitis	$(r)$ Heart valve defect
$(D)$ Paralysis	$(s)$ Increase in bile pigments in the blood
	$(t)$ Septal defect of heart

The state during which the respiratory centre is inhibited is termed as: