It is very serious disease of brain which is caused by fungi.

Rust
Meningitis
Smut
Ringworm

The correct answer is B. Meningitis.

Meningitis is a serious infection of the membranes that surround the brain and spinal cord. It can be caused by bacteria, viruses, or fungi. The most common symptoms of meningitis are fever, headache, stiff neck, and nausea. In severe cases, meningitis can lead to coma and death.

Rust is a plant disease caused by fungi. It is characterized by the formation of orange or brown spots on the leaves and stems of plants. Rust can cause significant damage to crops and ornamental plants.

Smut is a plant disease caused by fungi. It is characterized by the formation of black or brown powdery masses on the leaves, stems, and flowers of plants. Smut can cause significant damage to crops and ornamental plants.

Ringworm is a fungal infection of the skin. It is characterized by a ring-shaped rash that is often itchy and scaly. Ringworm can be treated with antifungal medications.

In conclusion, the correct answer is B. Meningitis. Meningitis is a serious infection of the membranes that surround the brain and spinal cord. It can be caused by bacteria, viruses, or fungi. The most common symptoms of meningitis are fever, headache, stiff neck, and nausea. In severe cases, meningitis can lead to coma and death.