The question asks about which type of forests are adapted to saline water. Let's explore the options given:

1. Evergreen Forests: These forests do not have a specific adaptation to saline conditions. They are characterized by trees that retain their leaves throughout the year.
2. Mangrove Forests: These forests are uniquely adapted to saline and brackish water conditions typically found along coastal regions. They have specialized root systems that filter salt out and allow them to thrive in challenging environments. Mangroves also provide important ecological benefits, such as protecting coastlines and serving as nurseries for marine life.
3. Deciduous Forests: These forests are found in regions with distinct seasonal changes. Trees shed their leaves annually and are not adapted to high salinity conditions.
4. Thorn Forests: Found in arid regions, these forests are characterized by thorny trees and shrubs. They are adapted to conserve water but not specifically to saline environments.

Based on the above discussion, the correct answer is Mangrove Forests because they have special adaptations to survive in saline water environments, unlike the other forest types.

Therefore, the correct answer is Mangrove.