Common cold differs from pneumonia in, that
A. Pneumonia can be prevented by a live attenuated bacterial whereas the common cold has no effective vaccine.
B. Pneumonia is caused by a virus while the common cold is caused by the bacterium Haemophilusinfluenzae
C. Pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs
D. Pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease
