Which of the following statements is TRUE regarding infection with Mycoplasma pneumoniae?
A) The causative agent is a fast-growing Gram-positive bacillus
B) It is extremely difficult to treat
C) The causative agent attaches to ciliated cells in the respiratory tract
D) It causes disease which is usually severe enough to require hospitalization
E) It is diagnosed by the appearance of typical "fried-egg" colonies on agar