Life history of malarial parasite in Anopheles was described by

Options

A. Ronald Ross
B. Grassi
C. Celli
D. Laveran

Answer

To solve the question regarding who described the life history of the malarial parasite in Anopheles mosquitoes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for the individual who described the life history of the malarial parasite specifically in Anopheles mosquitoes.

2. **Review the Options**: The options provided are:
- A) Ronald Ross
- B) Giovanni Battista Grassi
- C) Angelo Selly
- D) Labyrinth

3. **Evaluate Each Option**:
- **Option A: Ronald Ross** - He is known for his work on the transmission of malaria, but he did not describe the life history of the malarial parasite. Therefore, this option is incorrect.
- **Option B: Giovanni Battista Grassi** - He is credited with being the first to describe the life cycle of the malarial parasite (Plasmodium) in the female Anopheles mosquito. This option is correct.
- **Option C: Angelo Selly** - He focused on the prevention of malaria, not on the life history of the parasite. Thus, this option is incorrect.
- **Option D: Labyrinth** - This name is associated with the causative agent of malaria but does not pertain to the life history description. Therefore, this option is also incorrect.

4. **Conclusion**: Based on the evaluations, Giovanni Battista Grassi is the correct answer as he described the life history of the malarial parasite in Anopheles mosquitoes.

### Final Answer:
The life history of the malarial parasite in Anopheles was described by **Giovanni Battista Grassi**.

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