<e1>Roundworms</e1> or ascarids are caused by an intestinal <e2>parasite</e2> called Toxocara canis.
Roundworms or ascarids are
Roundworms or ascarids are caused by an intestinal parasite called Toxocara canis.
<triplet> Roundworms <subject> parasite <object> Product-Producer(e1,e2)