**Core Concept**
This patient presents with symptoms of severe depression, guilt, and suicidal ideation, which are characteristic of a condition known as **Cultural or Spiritual Delusional Depression**. This condition is often seen in patients from traditional or conservative backgrounds who hold strong spiritual or religious beliefs.

**Why the Correct Answer is Right**
The patient's symptoms are a classic example of a depressive disorder with delusional features. The presence of guilt, shame, and suicidal ideation are all indicative of a severe depressive episode. The fact that he is not convinced by his wife's reassurances and is instead fixated on his perceived sins suggests that he is experiencing a delusional disorder. The involvement of a spiritual guru further supports the cultural or spiritual context of this patient's presentation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the patient's cultural or spiritual context, which is crucial in managing this patient's condition. A purely pharmacological approach may not be sufficient to address the patient's underlying beliefs and values.

**Option B:** This option is incorrect because it does not take into account the patient's suicidal ideation, which requires immediate attention and intervention.

**Option C:** This option is incorrect because it does not acknowledge the patient's cultural or spiritual beliefs, which are integral to his presentation.

**Clinical Pearl / High-Yield Fact**
In patients with cultural or spiritual delusional depression, it is essential to approach the patient with sensitivity and respect for their cultural and spiritual beliefs. This may involve involving a spiritual leader or a cultural expert in the patient's treatment plan.

**Correct Answer: C.**
Counseling and supportive therapy with a focus on addressing the patient's cultural and spiritual beliefs.