Parasite which remains alive without development or multiplication is
**Core Concept**
The question tests the understanding of the lifecycle of parasites, specifically the concept of "survival" or "viability" in the host without actual development or multiplication. This is an essential aspect of parasitology, as it highlights the unique characteristics of certain parasites that enable them to survive and potentially cause disease.
**Why the Correct Answer is Right**
The correct answer refers to a parasite that remains alive in a dormant or quiescent state, often within the host's tissues or organs. This can be due to various factors, such as the parasite's lifecycle, the host's immune response, or environmental conditions. The parasite may not undergo development or multiplication, but it can remain viable and potentially reactivate at a later stage. This phenomenon is particularly relevant in the context of parasitic diseases, where the parasite's ability to survive and cause disease can have significant clinical implications.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe a parasite that remains alive without development or multiplication. A parasite that is "dormant" may still be in a state of suspended animation, but it is not necessarily "alive" in the classical sense.
* **Option B:** This option is incorrect because it refers to a parasite that is "encysted," which means it has formed a protective cyst around itself. While an encysted parasite may be viable, it is not necessarily "alive" without development or multiplication.
* **Option C:** This option is incorrect because it refers to a parasite that is "transmitted" or "infected." These terms do not accurately describe a parasite that remains alive without development or multiplication.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that certain parasites, such as the cysticerci of Taenia solium, can remain viable in a dormant state for extended periods. This can lead to delayed or recrudescent disease, making it crucial for clinicians to be aware of the parasite's lifecycle and potential for reactivation.
**Correct Answer: C. Cysticercus. A parasitic larval stage of Taenia solium that remains alive without development or multiplication.**