Which of the following is a flying insect that lays eggs in open wounds?

The correct choice is the blow flies, which are known for their behavior of laying eggs in open wounds. These flies are frequently associated with the decomposition of organic matter and have a distinct life cycle that is dependent on both the availability of suitable breeding sites and the presence of decaying or injured tissue. When they find an open wound on an animal, they will lay their eggs there, and the larvae that hatch can cause further tissue damage and complications. This makes blow flies particularly significant in veterinary medicine and animal husbandry, as their presence can indicate infection and may lead to more severe health issues for the animal.

Blow flies are often one of the first insects to arrive at a carcass or an injured animal, as they are attracted to the scents associated with decay and infection. Understanding their role and behavior is crucial for effective management and treatment of wounds in horses and other livestock.