**Question:** Acute primary meningoencephalitis true is -

A. Encephalitis
B. Encephalomyelitis
C. Meningitis
D. Meningoencephalitis

**Core Concept:** Acute primary meningoencephalitis refers to a rapidly progressive infection affecting the brain and its coverings (meninges), as well as the brain tissue itself. This condition is characterized by inflammation, which can lead to neurological symptoms and complications.

**Why the Correct Answer is Right:** In the context of acute primary meningoencephalitis, the correct answer refers to a condition involving the brain and meninges, making it a combination of meningitis (inflammation of the meninges) and encephalitis (inflammation of the brain). This description encompasses the key features of the disease: acute onset, primary (non-secondary) infection, and involvement of both meninges and brain tissue.

**Why Each Wrong Option is Incorrect:**

A. Encephalitis (Option A) is one of the components of the correct answer (D), but it does not stand alone as the primary diagnosis for acute primary meningoencephalitis.

B. Encephalomyelitis (Option B) is a misnomer, as it combines meninges and spinal cord inflammation, which is not the primary focus of acute primary meningoencephalitis.

C. Meningitis (Option C) is a part of the correct answer (D), but it refers to inflammation of the meninges only, not encompassing the involvement of the brain tissue as well.

D. Meningoencephalitis (Option D) is the correct answer, as it represents the combined condition of acute primary infection affecting both the meninges and brain tissue.

**Clinical Pearl:** Acute primary meningoencephalitis can result from a variety of infectious agents, including viruses, bacteria, and parasites. Prompt diagnosis and initiation of appropriate treatment are crucial to minimize neurological impairment and complications.

**Correct Answer:** D. Meningoencephalitis

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In summary, acute primary meningoencephalitis refers to a severe infection affecting both the meninges and brain tissue, causing inflammation and potential neurological symptoms. This condition is characterized by an acute onset and results from various infectious agents, including viruses, bacteria, and parasites. Early diagnosis and treatment are essential to minimize severe neurological impairment and complications.