## **Core Concept**
The question pertains to the management of tapeworm infestation in children, focusing on the most appropriate treatment option. Tapeworm infestations are caused by various species of cestodes, and the treatment typically involves antiparasitic medications.

## **Why the Correct Answer is Right**
Praziquantel is a broad-spectrum anthelmintic effective against a wide range of cestodes (tapeworms) and trematodes (flukes). It works by causing severe spasm and paralysis of the worms' muscles, leading to their expulsion from the gastrointestinal tract. Praziquantel is the drug of choice for treating many types of tapeworm infections, including those caused by Diphyllobothrium (fish tapeworm), Taenia (pork and beef tapeworms), and Hymenolepis (dwarf tapeworm).

## **Why Each Wrong Option is Incorrect**
- **Option A:** Niclosamide is an anthelmintic that is effective against tapeworms but is less commonly used nowadays due to its lower efficacy compared to praziquantel and the availability of more effective treatments. It is not the first-line treatment for frequent tapeworm infestations.
- **Option B:** Mebendazole is primarily used to treat infections caused by nematodes (roundworms), such as hookworms, whipworms, and pinworms. It is not the first choice for treating tapeworm infestations.
- **Option C:** Albendazole is a broad-spectrum anthelmintic effective against a variety of helminths, including both nematodes and cestodes. However, for tapeworm infestations specifically, praziquantel is generally preferred due to its efficacy and safety profile.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that praziquantel is the treatment of choice for most tapeworm infections. It's also important to note that in cases of frequent tapeworm infestation, identifying and treating the source of infection (e.g., undercooked meat or fish) and ensuring good hygiene practices are crucial to prevent re-infestation.

## **Correct Answer:** D. Praziquantel