This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
A 2 weeks old infant has conjunctivitis, which later developed into respiratory distress and pneumonia. Chest X-ray showed bilateral lung infiltrates. WBC count was 14,300/dL. Which of the following is the most likely organism? 
Select and explain. 
A. Chlamydia trachomatis, B. Streptococcus agalactiae, C. Gonococcus, D. Haemophilus influenzae
A: Chlamydia trachomatis
Answer: A: Chlamydia trachomatis 
Explanation: Answer- A. Chlamydia trachomatisChlamydia trachomatis: Of newborns infected by the mother, 10-20% may develop respiratory tract involvement 2-12 weeks after bih, culminating in pneumonia.Affected newborns have nasal obstruction or discharge, striking tachypnea, a characteristic paroxysmal staccato cough, an absence of fever, and eosinophilia. Interstitial infiltrates and hyperinflation can be seen on radiographs. The diagnosis should be suspected if pneumonitis develops in a newborn who has inclusion conjunctivitis and can be established by isolation of C. trachomatis from respiratory secretions.