A 30-year-old HIV positive patient presents with fever, dyspnoea and non-productive cough. The patient is cyanosed. His chest X-ray reveals bilateral, symmetrical interstitial infiltrates. The most likely diagnosis is -: (A) Tuberculosis, (B) Cryptococcosis, (C) Pneumocystis carinii pneumonia, (D) Toxoplasmosis
Answer is C. None