**Core Concept**
Preoperative shaving is a common practice to reduce the risk of surgical site infections. The ideal time for preoperative shaving is crucial in preventing skin irritation and promoting wound healing.

**Why the Correct Answer is Right**
The American Society of Health-System Pharmacists and the Centers for Disease Control and Prevention recommend shaving the night before surgery, allowing the skin to heal and reducing the risk of skin irritation. This timing also minimizes the risk of infection by reducing the number of bacteria on the skin. The skin's natural oils and moisture help to protect the skin and promote healing.

**Why Each Wrong Option is Incorrect**
**Option A:** Shaving immediately before surgery is incorrect because it can cause skin irritation, increase the risk of infection, and delay wound healing.
**Option B:** Shaving 2-3 days before surgery is incorrect because it may lead to ingrown hairs, skin irritation, and increased risk of infection.
**Option C:** Shaving is not necessary for patients with a high risk of bleeding, such as those with bleeding disorders or taking anticoagulant medications, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that preoperative shaving should be done with a clean razor and shaving cream, and the skin should be cleaned and dried thoroughly after shaving to reduce the risk of infection.

**Correct Answer:** A. The night before surgery.