Why does the surgeon draw on the patient before surgery? (A) It is the name of all the surgical team members so the patient can use their names during surgery.
(B)It is a physical reconfirmation that the surgery will take place on that limb or part of the body. I
(C)t’s an autograph; it brings good luck.
(D)It is a record of the time the surgeon first saw the patient that day.

B, It is a physical reconfirmation that the surgery will be on that limb or part of the body

Once the skin is opened, it becomes more difficult to visually identify landmarks that are important in knowing where nerves/blood vessels/etc. may be. They will sometimes also use a pen to mark those landmarks on the skin so they can be more quickly and accurately located when needed.

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health