in humans kidneys are situated between A vertebra and peritoneal kauwa is present only on their B side. A and B in the above mentioned statements are:

Options

A. `A - T_5 to T_12, B-ventral `
B. `A - T_12 to L_2, B- dorsal `
C. `A-T_12 to L_2, B-ventral `
D. `A-L_1 to L_5 B-dorsal `

Answer

To solve the question regarding the positioning of the kidneys in humans, we need to identify the vertebrae between which the kidneys are located (A) and the side on which the peritoneal cavity is present (B).

### Step-by-Step Solution:

1. **Understanding Kidney Location**:
- The kidneys are located in the abdominal cavity, specifically between the last thoracic vertebra (T12) and the first lumbar vertebra (L1).

2. **Identifying A**:
- Since the question asks for the vertebra (A) between which the kidneys are situated, we can conclude that A is T12. The kidneys are positioned between T12 and L1.

3. **Understanding Peritoneal Cavity**:
- The peritoneal cavity is a potential space within the abdominal cavity. The term "dorsal" refers to the back side of the body, while "ventral" refers to the front side.

4. **Identifying B**:
- The peritoneal cavity is located ventrally (towards the front) in relation to the kidneys. Therefore, B refers to the dorsal side of the peritoneal cavity.

5. **Final Answer**:
- A = T12 (the last thoracic vertebra)
- B = Dorsal side (the side opposite to the front of the body).

### Conclusion:
The correct answer is:
- A = T12
- B = Dorsal side