During first encounter with the same pathogen, our body elicits a response which is

Options

A. anamnestic
B. memory based
C. highly intensified
D. primary

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the type of immune response elicited by our body during the first encounter with the same pathogen.

2. **Identifying the Options**: The options provided are:
- A) Anamnestic
- B) Memory-based
- C) Highly intensified
- D) Primary

3. **Analyzing Each Option**:
- **Option A: Anamnestic**: This term refers to an enhanced immune response to an antigen that has been previously encountered. Since the question specifically mentions the "first encounter," this option does not apply.

- **Option B: Memory-based**: This refers to the immune system's ability to respond more rapidly and effectively to pathogens that have been encountered before. Again, this does not fit the context of a first encounter.

- **Option C: Highly intensified**: This could imply a strong immune response, but it is usually associated with subsequent encounters with a pathogen, not the first.

- **Option D: Primary**: The primary immune response is the initial response that occurs when the body encounters a pathogen for the first time. This response is typically of low intensity and takes time to develop.

4. **Conclusion**: Based on the analysis, the correct answer is **Option D: Primary**, as this is the response elicited during the first encounter with a pathogen.