A nurse is providing teaching to a client who is pregnant and is vegan. The nurse should instruct the client that which of the following foods is a reliable source of Vitamin B12?

A. This vitamin is water-soluble, not fat-soluble. It is important for immune function, collagen synthesis, and antioxidant protection. Since it is water-soluble, it does not require fat for absorption and is not typically included in fat-soluble vitamin supplements.
B. This vitamin is fat-soluble, meaning it requires fat for absorption. In conditions like acute pancreatitis, where fat absorption may be impaired, supplementation with vitamin A might be necessary to ensure adequate levels. Vitamin A is crucial for vision, immune function, and skin health.
C. This is a water-soluble vitamin involved in carbohydrate metabolism and nervous system function. It does not require fat for absorption and is not typically supplemented in cases of impaired fat absorption. It is important but not related to the fat-soluble vitamin needs in pancreatitis.
D. This is also a water-soluble vitamin necessary for red blood cell formation and neurological function. Although it can be affected in conditions of poor absorption, it is not a fat-soluble vitamin. It requires intrinsic factor for absorption in the intestines but does not relate to fat-soluble vitamin supplementation.

A. This refers to irregular bleeding between menstrual periods. While anorexia nervosa can lead to amenorrhea (the absence of menstruation) due to hormonal imbalances from severe weight loss and malnutrition, metrorrhagia is not a typical finding associated with anorexia nervosa.
B. This is a condition characterized by elevated levels of potassium in the blood. It is not a common finding in anorexia nervosa. Instead, clients with anorexia nervosa are more likely to have electrolyte imbalances such as hypokalemia (low potassium levels), especially if they engage in behaviors like vomiting or excessive use of laxatives.
C. This is a common finding in clients with anorexia nervosa. Constipation occurs due to inadequate intake of food and fluids, which results in decreased bowel motility. Malnutrition and dehydration from restricted intake can also contribute to this problem.
D. This refers to an abnormally fast heart rate. While tachycardia can occur in various conditions, in the context of anorexia nervosa, clients may actually exhibit bradycardia (slow heart rate) rather than tachycardia. The low body weight and malnutrition associated with anorexia can lead to a slowed heart rate as part of the body's response to starvation and decreased metabolic activity.