A patient presenting with falsifying symptoms or inducing injury without an obvious reward other than being a patient is suffering from?

The correct choice is Factitious Disorder. This condition involves individuals deliberately producing or feigning physical or psychological symptoms with the primary motive of assuming the sick role, rather than for any external incentives, such as financial gain or avoiding responsibility. Patients with Factitious Disorder seek to gain attention, sympathy, or emotional comfort through their role as a patient.

In contrast, Somatization Disorder, which is characterized by the presence of multiple, persistent physical symptoms that cannot be fully explained by a medical condition, is not driven by the conscious fabrication of symptoms. Conversion Disorder involves neurological symptoms that arise in response to psychological distress, typically without a physical cause, but again, the intent to deceive is not present as it is in Factitious Disorder. Malingering involves the intentional production of false or exaggerated symptoms, but the primary motivation is usually for external gain such as financial compensation or evading a duty, which differentiates it from Factitious Disorder. In summary, Factitious Disorder is distinct in that the underlying motivation revolves solely around adopting the patient role without ulterior benefits.