A portion of stomach opens into the duodenum via B select the option which correctly describes A and B respectively.
(a) A) Fundus, B)cardiac sphincter
(b) A) Cardiac, B) Pyloric sphincter
(c) A) Pyloric, B) Gastroesophageal sphincter
(d) A) Pyloric, B) Pyloric sphincter

Options

A. A) Fundus,B)cardiac sphinter
B. A) Cardiac,B) Pyloric sphincter
C. A)Pyloric,B) Gastroesophageal sphincter
D. A)Pyloric B)Pyloric sphincter

Answer

To solve the question, we need to identify the correct portions of the stomach and the sphincter that connects to the duodenum.

### Step-by-Step Solution:

1. **Identify the Portion of the Stomach (A)**:
- The question states that a portion of the stomach opens into the duodenum. The part of the stomach that connects to the duodenum is known as the **pylorus**. The pylorus is the last section of the stomach and is responsible for regulating the passage of partially digested food into the small intestine.

2. **Identify the Sphincter (B)**:
- The pylorus opens into the duodenum through a sphincter. This sphincter is called the **pyloric sphincter**. The pyloric sphincter controls the flow of chyme (partially digested food) from the stomach into the duodenum, ensuring that it only passes when it is ready.

3. **Match A and B with the Options**:
- Now that we have identified A as the **pylorus** and B as the **pyloric sphincter**, we can look at the options provided:
- (a) A) Fundus, B) cardiac sphincter
- (b) A) Cardiac, B) Pyloric sphincter
- (c) A) Pyloric, B) Gastroesophageal sphincter
- (d) A) Pyloric, B) Pyloric sphincter

4. **Select the Correct Option**:
- The correct option that describes A and B is **(d) A) Pyloric, B) Pyloric sphincter**.

### Final Answer:
The correct option is **(d) A) Pyloric, B) Pyloric sphincter**.