Blank can be described as to the right and left of the epigastric region.

A. Umbilical
B. Olliac
C. Hypochondriac
D. Lumbar

C. Hypochondriac

The correct answer is A. Umbilical.

To determine the correct answer, we can start by understanding the anatomical terms used in the question:

1. Epigastric region: This is the upper middle region of the abdomen, located just below the sternum (breastbone) and between the two hypochondriac regions.
2. Right and Left: These terms refer to the sides of the body, with the right side being on the person's right-hand side and the left side being on the person's left-hand side.

Now, let's evaluate each option by their placement in relation to the epigastric region:

A. Umbilical: The umbilical region is located centrally, around the navel (belly button). It is not to the right or left of the epigastric region. Therefore, this option is incorrect.
B. Olliac: It appears that there might be a typographical error here, as "Olliac" is not a recognized anatomical term. It doesn't describe any specific anatomical region, so we can eliminate this option.
C. Hypochondriac: The hypochondriac regions are located on the right and left sides of the epigastric region. Therefore, this option matches the description given in the question and is a valid answer.
D. Lumbar: The lumbar region is located at the lower back, between the ribs and the pelvis. It is not in the immediate vicinity of the epigastric region, so this option is also incorrect.

Therefore, the correct answer is:
C. Hypochondriac.