This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Humoral immunodeficiency is suspected in a patient and he is under investigation. Which of the following infections would not be consistent with the diagnosis: 
Select and explain. 
A. Giardiasis, B. Pneumocystis carinii pneumonia, C. Recurrent sinusitis, D. Recurrent subcutaneous abscesses
B: Pneumocystis carinii pneumonia
Answer: B: Pneumocystis carinii pneumonia 
Explanation: Pneumocystis carnii pneumonia is associated with deficient cell-mediated immunity and not with humoral immunodeficiency(ref: Harrison's 18/e p2699)