Pneumonia can only be caused by bacteria, such as Streptococcus pneumoniae. (True or false?)

Pneumonia can only be caused by bacteria, such as Streptococcus pneumoniae.
 
  Indicate whether the statement is true or false.

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Antigens are non-self substances.
 
  Indicate whether the statement is true or false.

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Mutations allow bacteria to overcome the effects of an antibiotic.
 
  Indicate whether the statement is true or false.

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If Lyme disease goes untreated it can lead to permanent neurological problems.
 
  Indicate whether the statement is true or false.

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Flu symptoms are worse than the symptoms of the common cold, but no one dies from the flu.
 
  Indicate whether the statement is true or false.