Final answer:
Custard is recommended for a postoperative patient seeking a snack that aids in wound healing due to its protein content which is essential for tissue repair.
Step-by-step explanation:
For a postoperative patient who is able to eat and requiring a snack that will facilitate wound healing, the best choice from the options given is custard. Custard contains protein, which is vital for the repair and regeneration of tissues, as well as energy for the healing process. Proteins form the building blocks of the body's tissues, including the skin and underlying structures that may need to recover after surgery. A balanced diet with adequate protein intake is essential for effective wound healing.