Vitamins were discovered by
 (a) Mellanby
(b) Funk
(c) Buchner
(d) Jenner

Options

A. Mellanby
B. Funk
C. Buchner
D. Jenner

Answer

To solve the question "Vitamins were discovered by," we need to analyze each of the given options:

1. **Option (a) Mellanby**:
- Edward Mellanby was a nutritionist known for his work on vitamin D. However, he did not discover vitamins in general. Therefore, this option is not correct.

2. **Option (b) Funk**:
- Casimir Funk is the correct answer. He is credited with isolating a substance that he named "vitamin," which he identified as vital for the life of organisms. Thus, he is recognized as the discoverer of vitamins.

3. **Option (c) Buchner**:
- Buchner was a zymologist who focused on fermentation processes. He did not discover vitamins, making this option incorrect.

4. **Option (d) Jenner**:
- Edward Jenner is known for developing the concept of vaccination and for creating the smallpox vaccine. He did not discover vitamins, so this option is also incorrect.

Based on the analysis, the correct answer is **(b) Funk**.

### Summary of the Steps:
1. Identify the contributions of Edward Mellanby.
2. Research Casimir Funk's work and his role in the discovery of vitamins.
3. Evaluate the contributions of Buchner regarding fermentation.
4. Assess Edward Jenner's contributions to vaccination.
5. Conclude that the correct answer is (b) Funk.