This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
Which of the following infestation leads to malabsorption- 
Select and explain. 
A. Giardia lamblia, B. Ascaris lumbricoides, C. Necater Americana, D. Ancylostoma duodenale
A: Giardia lamblia
Answer: A: Giardia lamblia 
Explanation: G.lamblia is present within the glandular crypts of duodenal jejunal mucosa and doesnot invade the tissues.The parasite attaches itself to the epithelial surface of duodenum and jejunum by means of sucking disc.It may cause a disturbance of intestinal function,leading to malabsorption of fat (refer pgno:32 baveja 3rd edition)