What disease in sheep is caused by a strain of Clostridium tetani?

Tetanus in sheep is caused by the bacterium Clostridium tetani, which is known for producing a potent toxin that affects the nervous system. When the bacteria enter the body, typically through wounds or injuries, they can produce this toxin, leading to muscle stiffness, spasms, and other severe neurological symptoms. This disease is particularly concerning in environments where sheep may be at risk of injury, allowing the bacteria entry.

In contrast, the other diseases mentioned in the options are caused by different pathogens or conditions. Enterotoxemia, for instance, is primarily caused by Clostridium perfringens and is characterized by sudden death in sheep due to toxins affecting the gut. Urinary Calculi refers to urinary stones that can cause blockage and is not related to bacterial infections. White Muscle Disease, often seen in lambs, is a nutritional deficiency related to selenium and vitamin E, rather than an infectious disease. Therefore, Tetanus is specifically linked to Clostridium tetani, making it the correct answer.