A good source of vitamins A and D is:

Options

A. whole cereal
B. cod liver oil
C. yeast
D. water melon

Answer

To determine a good source of vitamins A and D from the given options, we can analyze each option based on their known nutritional content.

### Step-by-Step Solution:

1. **Identify the Vitamins**: We need to find a source that is rich in both Vitamin A and Vitamin D.

2. **Examine the Options**:
- **Option 1: Whole Cereal**: Whole cereals are primarily known for their B vitamins, particularly B1 (thiamine) and B6. They are not significant sources of vitamins A or D.
- **Option 2: Cod Liver Oil**: Cod liver oil is well-known for being an excellent source of both Vitamin A and Vitamin D. It is often recommended as a dietary supplement for these vitamins.
- **Option 3: Yeast**: Yeast is a good source of B vitamins, particularly B6 and B12, but it does not provide significant amounts of vitamins A or D.
- **Option 4: Watermelon**: Watermelon contains Vitamin A (in the form of beta-carotene) and Vitamin C, but it is not a source of Vitamin D.

3. **Conclusion**: After analyzing all the options, the only option that provides both Vitamin A and Vitamin D is **Cod Liver Oil**.

4. **Final Answer**: Therefore, the correct answer is **Option 2: Cod Liver Oil**.