Both corpus lutea and macula lutea are

Options

A. found in human ovaries
B. a source of hormones
C. characterized by a yellow colour
D. Contribute in maintaining pregnancy

Answer

To answer the question "Both corpus lutea and macula lutea are," we need to analyze the characteristics of both terms.

### Step-by-Step Solution:

1. **Understanding Corpus Luteum**:
- The corpus luteum is a structure that forms in the ovary after ovulation. It develops from the ovarian follicle that has released an egg.
- It is characterized by its yellow color due to the presence of luteal cells that produce hormones, primarily progesterone, which is crucial for maintaining pregnancy.

2. **Understanding Macula Lutea**:
- The macula lutea, on the other hand, is a small yellowish area located in the retina of the eye.
- It is responsible for high-acuity vision and contains a high concentration of photoreceptor cells (cones).

3. **Comparing Characteristics**:
- Both structures are indeed characterized by a yellow color. However, they are found in different locations and serve different functions.
- The corpus luteum is involved in reproductive hormone production and maintaining pregnancy, while the macula lutea is involved in vision.

4. **Identifying the Correct Option**:
- The question asks for a common characteristic of both the corpus lutea and macula lutea.
- The correct answer is that both are characterized by a yellow color.

### Conclusion:
The correct option is **C: characterized by a yellow color**.

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