Which is presently most inflective ?

Options

A. Aedes
B. Anopheles
C. Culex
D. Trilobite

Explanation

To solve the question "Which is presently most infective?" regarding the options provided, we will analyze each option step by step.

### Step 1: Identify the Organisms
The options given are:
1. Aedes
2. Anopheles
3. Culex
4. Trilobite

### Step 2: Understand Each Organism
- **Aedes**: This is a genus of mosquitoes known to transmit diseases such as dengue fever and Zika virus.
- **Anopheles**: This is another genus of mosquitoes, which is primarily known for transmitting malaria.
- **Culex**: This genus of mosquitoes is known to transmit diseases like filariasis and West Nile virus.
- **Trilobite**: This is an extinct group of marine arthropods and is not known to be infective as it does not exist today.

### Step 3: Determine Infectivity
To determine which of these is "most infective," we need to consider the diseases they transmit and their impact:
- **Malaria (Anopheles)**: A highly infectious disease that affects millions of people worldwide.
- **Dengue (Aedes)**: Also a significant health concern but generally has a lower infection rate compared to malaria.
- **Filariasis (Culex)**: While it is a serious disease, it does not have the same level of global impact as malaria.

### Step 4: Conclusion
Based on the analysis, **Anopheles** is associated with malaria, which is currently one of the most infective diseases globally. Therefore, the answer to the question is:

**Answer: Option 2 - Anopheles**

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