**Core Concept:** A person who feigns illness for personal benefit is known as a malingerer or somatic symptom disorder patient. This concept is related to understanding mental health disorders and their presentation in clinical practice.

**Why the Correct Answer is Right:** A malingerer is a person who fabricates or exaggerates physical symptoms for personal gain or to avoid responsibilities or tasks. In this case, the correct answer is **D**. Malingerers may seek attention, sympathy, or avoid work or legal consequences. They often have a history of manipulation, and their symptoms are typically inconsistent and unrelated to known medical conditions.

**Why Each Wrong Option is Incorrect:** Option A is incorrect as it refers to a patient who genuinely suffers from a disease. Option B is incorrect as it describes a patient with a legitimate disease, not a malingerer. Option C is incorrect as it involves a patient with a genuine illness, not a malingerer. Option E is incorrect as it refers to a patient with a genuine illness and not a malingerer.

**Clinical Pearl / High-Yield Fact:** Be cautious of malingerers in clinical practice, as they can lead to misdiagnosis, unnecessary tests, and increased financial burden on healthcare systems. In some cases, malingerers may also involve others in their deception, making diagnosis more challenging.

**Correct Answer:** D. Malingerer (also known as somatic symptom disorder patient)