This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunodeficiency, Subject name: Microbiology
Hypogammaglobinemia causes? 
Select and explain. 
A. Chronic recurrent sinusitis, B. Epistaxis, C. Contractures, D. Eczema
A: Chronic recurrent sinusitis
Answer: A: Chronic recurrent sinusitis 
Explanation: Ans. (a) Chronic recurrent sinusitisRef.: Harrison 18thedch-316