Which statement is true regarding vitamins?

The statement that vitamins must be obtained from the diet is true because while some vitamins can be synthesized in small amounts by the body, most of them cannot be produced in sufficient quantities and therefore need to be consumed through food. Vitamins play vital roles in numerous bodily functions, such as metabolism and immune response, making them essential nutrients.

While certain vitamins, such as vitamin D, can be synthesized when exposed to sunlight, this does not negate the general requirement for dietary intake of most vitamins, such as vitamin C and the B vitamins. These are crucial for maintaining health, and deficiencies can lead to a range of health issues.

Although some vitamins are abundant in animal products, others are predominantly found in plant sources; thus, it's inaccurate to claim that they are only found in animal products. Additionally, vitamins are indeed essential for healthy functioning, contradicting any statement implying otherwise.