Which of the following is incorrectly matched?

Options

A. Secrete hormones-endocrine glands
B. Found in the umbilical cord-mucous connective tissue
C. Secrete perspiration, oil, wax, mucus -exocrine glands
D. Most abundant cartilage-fibrocartilage

Explanation

To determine which of the following options is incorrectly matched, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the first option: Secret hormones - Endocrine glands**
- Endocrine glands are known to be ductless glands that secrete hormones directly into the bloodstream. This is a correct match.

2. **Identify the second option: Found in the umbilical cord - Mucous connective tissue**
- Mucous connective tissue is indeed found in the umbilical cord. This is also a correct match.

3. **Identify the third option: Secrete perspiration, oil, wax, mucus - Exocrine glands**
- Exocrine glands are characterized by having ducts and they secrete substances like perspiration, oil, wax, and mucus onto epithelial surfaces. This is a correct match.

4. **Identify the fourth option: Most abundant cartilage - Fibrocartilage**
- Fibrocartilage is not the most abundant type of cartilage in the human body. The most abundant cartilage is actually hyaline cartilage, which is found in various locations such as long bones, parts of the skull, tips of the ribs, and tracheal rings. Therefore, this is an incorrect match.

### Conclusion:
The incorrectly matched option is: **Most abundant cartilage - Fibrocartilage.** The correct match should be **Most abundant cartilage - Hyaline cartilage.**

---