Which helminthic disease can result from ingestion of undercooked fish?

The disease that can result from the ingestion of undercooked fish is Diphyllothriasis, which is caused by the fish tapeworm, specifically Diphyllobothrium latum. This helminth is typically acquired through eating raw or undercooked freshwater fish that contain the larval form of the parasite. Once ingested, the larva can develop into an adult tapeworm in the intestine, leading to various symptoms, including abdominal discomfort, diarrhea, and potential vitamin B12 deficiency.

In contrast, Enterobiasis is caused by the pinworm (Enterobius vermicularis), which is transmitted via the fecal-oral route, primarily through ingestion of eggs rather than through consumption of fish. Schistosomiasis arises from contact with freshwater sources contaminated with the larvae of schistosomes, and Onchocerciasis, also known as river blindness, is transmitted through the bite of infected blackflies. Thus, the specific link between undercooked fish and the development of Diphyllothriasis clearly identifies it as the correct answer, distinguishing it from the other helminthic diseases listed.