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
All cause malabsorption except 
Select and explain. 
A. Giardia lamblia, B. Mycobacterium avium-intracellulare, C. Ascariasis, D. Microsporidium
C: Ascariasis
Answer: C: Ascariasis 
Explanation: Ascariasis