**Core Concept**
Korsakoff's psychosis is a neurological disorder characterized by memory loss, confusion, and difficulty with learning new information, often resulting from chronic alcohol abuse and thiamine deficiency. It is associated with damage to the medial temporal lobe and diencephalon, particularly the mammillary bodies and the thalamus.

**Why the Correct Answer is Right**
Korsakoff's psychosis is characterized by the presence of Wernicke-Korsakoff syndrome, which includes symptoms such as confusion, ataxia, and ophthalmoplegia. Patients with Korsakoff's psychosis often have an impaired ability to form new memories, a condition known as anterograde amnesia. They may also exhibit retrograde amnesia, where they are unable to recall memories formed before the onset of the disorder.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is likely incorrect as patients with Korsakoff's psychosis often exhibit nystagmus, which is an involuntary movement of the eyes.
**Option B:** This option is incorrect as patients with Korsakoff's psychosis may have a normal or slightly elevated blood pressure, which is not a characteristic feature of the disorder.
**Option C:** This option is incorrect as patients with Korsakoff's psychosis may have a normal or slightly elevated body temperature, which is not a characteristic feature of the disorder.

**Clinical Pearl / High-Yield Fact**
Korsakoff's psychosis is often associated with Wernicke's encephalopathy, which is a condition characterized by confusion, ataxia, and ophthalmoplegia. Early recognition and treatment of Wernicke's encephalopathy can prevent the development of Korsakoff's psychosis.

**Correct Answer:** Not provided. Please provide the correct answer to complete the explanation.