**Core Concept**
Local anaesthetics are used to block nerve conduction in a specific area, providing pain relief during surgical procedures. They act by inhibiting the sodium channels in nerve membranes, thereby preventing the initiation and transmission of nerve impulses.

**Why the Correct Answer is Right**
For nasal surgery, a local anaesthetic that is effective and has minimal systemic absorption is preferred. Cocaine is a potent local anaesthetic that is also a vasoconstrictor, which helps to reduce bleeding during surgery. Its ability to produce analgesia and vasoconstriction makes it an ideal choice for nasal surgery.

**Why Each Wrong Option is Incorrect**
**Option A:** Lidocaine is a commonly used local anaesthetic, but it is not typically used for nasal surgery due to its potential for systemic absorption and toxicity.
**Option B:** Bupivacaine is another local anaesthetic that is often used for regional anaesthesia, but it is not the preferred choice for nasal surgery due to its potential for cardiac toxicity.
**Option C:** Procaine is a short-acting local anaesthetic that is not commonly used for nasal surgery due to its rapid metabolism and short duration of action.

**Clinical Pearl / High-Yield Fact**
Cocaine's vasoconstrictive properties can also lead to nasal septal perforation and rhinitis medicamentosa with prolonged use.

**Correct Answer:** C. Cocaine