Which one of the following provide nonspecific pathogen defence for the body?

Options

A. T-cells
B. B-cells
C. Phagocytes
D. Stem cells

Answer

To answer the question, "Which one of the following provides nonspecific pathogen defense for the body?" we will analyze the options provided:

1. **T cells**: These are a type of lymphocyte that plays a central role in the adaptive immune response. They are specific to particular pathogens and are not involved in nonspecific defense.

2. **B cells**: Similar to T cells, B cells are also part of the adaptive immune system. They produce antibodies that are specific to particular antigens, thus they do not provide nonspecific defense.

3. **Phagocytes**: These are immune cells that engulf and digest pathogens and debris. They are part of the innate immune system and provide nonspecific defense against a wide range of pathogens, including bacteria and viruses.

4. **Stem cells**: These are undifferentiated cells that can develop into various cell types. They do not play a direct role in pathogen defense.

Based on this analysis, the correct answer is **phagocytes**. They are responsible for nonspecific pathogen defense in the body.

### Step-by-Step Solution:
1. **Identify the options**: T cells, B cells, phagocytes, stem cells.
2. **Analyze T cells**: Understand that they are part of the adaptive immune response and provide specific defense.
3. **Analyze B cells**: Recognize that they also provide specific defense through antibody production.
4. **Analyze phagocytes**: Note that they are part of the innate immune system and provide nonspecific defense by engulfing pathogens.
5. **Analyze stem cells**: Understand that they do not directly contribute to pathogen defense.
6. **Conclude**: Identify that phagocytes are the only option that provides nonspecific pathogen defense.