The 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 there is no effective vaccine for the common cold.
• C
  Pneumonia is caused by a virus while the common cold is caused by the bacterium $Haemophilus$ $influenzae$.
• D
  Pneumonia pathogens infect the alveoli whereas the common cold affects the nose and respiratory passage but not the lungs.