Identify the incorrect pair
A. Ameloblasts- ènamel
B. Haustra- rectum
C. Sphincter ofOddi - hepato -pacreatic duct
D. Brunner's glands- duodenal mucosa

Options

A. a, c
B. b,d
C. c,d
D. a,b

Answer

To solve the question of identifying the incorrect pair from the given options, we will analyze each pair one by one.

### Step-by-Step Solution:

1. **Analyze Pair A: Ameloblasts - Enamel**
- Ameloblasts are specialized cells that are responsible for the formation of enamel, which is the hard outer layer of teeth.
- **Conclusion**: This is a correct pair.

2. **Analyze Pair B: Haustra - Rectum**
- Haustra are the small pouches that give the colon its segmented appearance. They are characteristic of the large intestine, specifically the colon.
- The rectum is the final section of the large intestine but does not have haustra.
- **Conclusion**: This is an incorrect pair because haustra are not found in the rectum; they are found in the colon.

3. **Analyze Pair C: Sphincter of Oddi - Hepatopancreatic Duct**
- The Sphincter of Oddi is a muscular valve that controls the flow of digestive juices (bile and pancreatic juice) from the hepatopancreatic duct into the duodenum.
- **Conclusion**: This is a correct pair.

4. **Analyze Pair D: Brunner's Glands - Duodenal Mucosa**
- Brunner's glands are located in the submucosa of the duodenum and secrete alkaline mucus to protect the duodenum from gastric acid.
- **Conclusion**: While Brunner's glands are associated with the duodenum, they are specifically located in the submucosa, not the mucosa. However, this does not make the pair incorrect as they are still related to the duodenum.

### Final Conclusion:
- The incorrect pair is **B: Haustra - Rectum**. Haustra are part of the colon, not the rectum.