Q. Common cold differs from pneumonia in that :
(a) Pneumonia is caused by a virus while the common cold is caused by the bacterium Haemophilus influenzae.
(b) Pneumonia pathogen infects alveoli, whereas, the common cold affects nose and respiratory passage but not the lungs.
(c) Pneumonia is a non-communicable disease whereas common cold is a communicable disease
(d) Pneumonia can be prevented by a live attenuated bacterial vaccine whereas common cold has no effective vaccine
Solution : Correct option : B The common cold is a viral disease, which is caused by a viral infection of the upper respiratory tract (nose and throat), whereas, pneumonia is an inflammatory condition of the lung affecting primarily the microscopic air sacs known as alveoli.