Which of the following infestation leads to malabsorption -
Disease manifestations of giardiasis range from asymptomatic carriage to fulminant diarrhea and malabsorption.

Note: Ancylostoma duodenale also causes malabsorption, but only in children. On the other hand, Giardia causes malabsorption both in children as well as in adults.
Giardia lamblia
Ascaris lumbricoides
Necator Americanus
Ancylostoma duodenale