Correct Answer: D

Rationale: Venlafaxine is classified as a serotonin-norepinephrine reuptake inhibitor (SNRI). SNRIs work by increasing the levels of both serotonin and norepinephrine in the brain, which helps alleviate symptoms of depression. This mechanism of action distinguishes SNRIs from other classes of antidepressants like SSRIs, TCAs, and MAOIs, making venlafaxine an effective choice for patients with major depressive disorder. Therefore, the correct answer is D. Choice A, SSRIs, primarily target serotonin reuptake only. Choice B, TCAs, work by inhibiting the reuptake of norepinephrine and serotonin, but they are not as selective as SNRIs. Choice C, MAOIs, inhibit the enzyme monoamine oxidase, leading to increased levels of various neurotransmitters, including serotonin and norepinephrine, but they are typically used as second- or third-line agents due to dietary restrictions and potential side effects.

Correct Answer: B

Rationale: The most crucial initial treatment goal for anorexia nervosa is restoring nutritional status. This is essential to prevent life-threatening complications associated with severe malnutrition, such as organ damage and cardiac issues. Addressing distorted body image, resolving family conflicts, and increasing social interactions are important aspects of treatment, but they are secondary to the critical need of restoring the patient's nutritional status to ensure their physical well-being and recovery.

Correct Answer: B

Rationale: Patients prescribed lithium should maintain a consistent salt intake. Fluctuations in salt intake can impact lithium levels, potentially leading to toxicity or reduced effectiveness of the medication. It is crucial for patients to adhere to a stable salt intake while taking lithium to ensure optimal treatment outcomes. Choices A, C, and D are incorrect. Avoiding foods high in tyramine is more relevant for patients on MAOIs, not lithium. Increasing protein intake or avoiding foods high in fat are not specific dietary recommendations for patients taking lithium.

Correct Answer: C

Rationale: The correct answer is C: Decreased need for sleep. A decreased need for sleep is a hallmark symptom of a manic episode in bipolar disorder. During manic episodes, individuals may experience significantly reduced sleep without feeling tired, which can lead to increased energy levels, impulsivity, and other manic symptoms. Excessive sleeping (choice A) is more indicative of depression rather than mania. Low self-esteem (choice B) and anhedonia (choice D) are also more commonly associated with depressive episodes rather than manic episodes in bipolar disorder.

Correct Answer: B

Rationale: Lithium is a well-established mood stabilizer commonly prescribed for the treatment of bipolar disorder. It helps to control manic episodes, stabilize mood swings, and reduce the risk of relapse in individuals with this condition. Sertraline is an antidepressant commonly used for treating depression, while Clozapine and Haloperidol are antipsychotic medications used for different psychiatric conditions. Therefore, the correct answer is B because it is specifically indicated and effective for bipolar disorder.