The correct answer is B. Mumps.
Mumps is a contagious disease caused by a virus that infects the salivary glands. The parotid glands, which are located in front of the ears, are usually the most affected. Mumps can also cause fever, headache, muscle aches, and fatigue.
Tetanus is a bacterial infection caused by Clostridium tetani. The bacteria can enter the body through a cut or wound. Tetanus can cause muscle stiffness, spasms, and difficulty breathing.
Pyorrhoea is a gum disease that is caused by bacteria. Pyorrhoea can cause inflammation, redness, and bleeding of the gums.
Ulcers are sores that can develop in the stomach or small intestine. Ulcers can be caused by a number of factors, including bacteria, stress, and certain medications.
Mumps is a more serious condition than the other options, and it can lead to complications such as meningitis, encephalitis, and pancreatitis. Mumps can also be prevented by vaccination.