B

Taenia solium eggs are spherical with a thick, radially-striated shell and an internal six-hooked oncosphere. Humans acquire the adult tapeworm by eating cysticerci in under-cooked pork and can also become accidental intermediate hosts when they ingest eggs, leading to cysticercosis; thus both the adult (intestinal) and larval (tissue) stages occur in humans. Transmission is not always via pork (eggs come from human feces), infection is not self-limiting, and praziquantel—not albendazole—is first-line for intestinal taeniasis. [Garcia, 2000, PMID 10738675; Ancarola, 2024, PMID 38556448]