Which of the following infestation leads to malabsorption -
Giardia lamblia
Ascaris lumbricoides
Necator Americanus
Ancylostoma duodenale
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.