**Core Concept**
The elderly housewife is experiencing hallucinations, specifically auditory hallucinations, where she hears her deceased husband's voice. This is a classic symptom of a psychiatric disorder known as Persistent Complex Bereavement Disorder (PCBD) or, more commonly, Prolonged Grief Disorder (PGD) or complicated grief. However, the presence of hallucinations suggests a psychotic component, which is often seen in Major Depressive Disorder with Psychotic Features or a Psychotic Disorder due to a medical condition.

**Why the Correct Answer is Right**
The correct answer is Haloperidol, an antipsychotic medication, because the patient is experiencing hallucinations, a primary symptom of psychosis. Haloperidol is a typical antipsychotic that can help alleviate hallucinations and other psychotic symptoms. It acts by blocking dopamine receptors in the brain, particularly D2 receptors, which are involved in the pathophysiology of psychosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Clonipramine is a tricyclic antidepressant (TCA) and a serotonin-norepinephrine reuptake inhibitor (SNRI). While it can be used to treat depression, it is not the first-line treatment for psychosis or hallucinations. Clonipramine may even exacerbate psychotic symptoms in some cases.

**Option B:** Alprazolam is a benzodiazepine anxiolytic, which may be used to treat anxiety but is not effective in treating hallucinations or psychosis. In fact, benzodiazepines can sometimes worsen psychotic symptoms.

**Option C:** Electroconvulsive therapy (ECT) is a treatment for severe or treatment-resistant depression, but it is not typically used as a first-line treatment for psychosis or hallucinations. While ECT can be effective in treating depression, it may not directly address the psychotic symptoms.

**Option D:** Haloperidol is the correct answer, as explained above.

**Clinical Pearl / High-Yield Fact**
When treating patients with psychosis or hallucinations, it's essential to rule out underlying medical conditions that may be contributing to the symptoms. In this case, the patient's recent bereavement and history of infrequent social interaction may have contributed to her vulnerability to psychosis. A thorough psychiatric evaluation and medical workup are crucial in managing these patients.

✓ Correct Answer: D. Haloperidol.