Detailed Solution:
The correct answer is “(A) is true, but (R) is false.”.
Most vitamins, such as vitamin C, B vitamins, and vitamin A, are not produced by the human body and need to be consumed through food or supplements.
While certain micronutrients can be synthesized by the body (e.g., Vitamin D through sun exposure), the body does not synthesize most essential vitamins, which is why dietary intake is necessary.