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