###Rationale: Chlamydiae

###Answer: OPTION B IS CORRECT.
###Question: A patient (pigeon handler) presents with interstitial pneumonitis accompanied by headache, backache, and a dry, hacking cough. A pale, macular rash is also found on the trunk (Horder's spots). Likely organism is:
###Options:
A. Histoplasma
B. Chlamydiae
C. Mycoplasma
D. Aspergillus
