Which corps focuses on construction, repair, and maintenance of infrastructure?

The correct focus on construction, repair, and maintenance of infrastructure aligns with general engineering. This corps is responsible for a range of tasks that include building and maintaining facilities, roads, bridges, and other essential structures within military contexts. They ensure that the operational capabilities of the military are supported by adequate infrastructure, which is crucial for effective missions and logistics.

The other options relate to specific fields that do not encompass the broad responsibilities of infrastructure maintenance. For example, the medical corps focuses on medical care and support for personnel, while the dental corps is specialized in dental care. The medical service corps provides support services related to healthcare but does not engage in construction or engineering tasks. Thus, general engineering distinctly stands out as the corps dedicated to infrastructure-related activities.