While vacationing in a country that lacks adequate meat inspection, a student ate undercooked ground beef. Sometime later the student became easily fatigue, and lost body weight. At about the same time, whitish, flattened, rectangular objects full of small white spheres started appearing in his feces. Administration of nicodamids cured the problem. The student had probably been infected by a ____?


a.
hookworm


b.
pinworm


c.
nematode


d.
tapeworm