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A cestode with only 3 segements is...

A cestode with only 3 segements is

A

Taenia solium

B

Diphyllobothrium lattum

C

Echinococcus

D

Hymenolipis nana.

Text Solution

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The correct Answer is:
To solve the question regarding which cestode has only three segments (or proglottids), we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Question**: The question is asking for a specific type of cestode (a class of flatworms) that has only three segments or proglottids. 2. **Identify the Options**: The options provided are: - Teniosoleum - Diphyllobothrium latum - Echinococcus - Hymnolipus nana 3. **Define Cestodes**: Cestodes are parasitic flatworms that belong to the class Cestoda. They are characterized by their segmented bodies, which are made up of units called proglottids. 4. **Research Each Option**: - **Teniosoleum**: Generally has more than three proglottids. - **Diphyllobothrium latum**: Known to have many proglottids, far exceeding three. - **Echinococcus**: The adult form is typically 3 to 6 mm long and has only three proglottids: an immature proglottid, a mature proglottid, and a gravid proglottid. - **Hymnolipus nana**: Also has more than three proglottids. 5. **Conclusion**: Based on the characteristics of the options, Echinococcus is the only cestode that fits the criteria of having only three segments or proglottids. 6. **Final Answer**: Therefore, the correct answer is **Echinococcus**.
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