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Onchosphere occurs in:

1. Ascaris
2. Fasciola
3. Taenia
4. Planaria

Correct answer: Taenia

Solution

Onchosphere (hexacanth embryo) is the larval form inside the eggs of Taenia species. It is characteristic of cestodes, especially Taenia, and not of Ascaris, Fasciola, or Planaria.

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