**Core Concept**
The question is testing the knowledge of local anesthetics used in ophthalmic surgery. Ophthalmic surgery requires a local anesthetic that can effectively anesthetize the cornea and conjunctiva without causing significant irritation or toxicity.

**Why the Correct Answer is Right**
The correct answer is **C. Tetracaine**. Tetracaine is a potent ester local anesthetic commonly used in ophthalmic surgery due to its long duration of action and ability to anesthetize the cornea and conjunctiva. It is often used in the form of a 1% or 2% solution in a preservative-free format to minimize irritation.

**Why Each Wrong Option is Incorrect**
* **Option A:** Cocaine is an ester local anesthetic, but it is not the best choice for ophthalmic surgery due to its potential for causing vasoconstriction and increased intraocular pressure.
* **Option B:** Lidocaine is a widely used local anesthetic, but it has a shorter duration of action than tetracaine and may not provide adequate anesthesia for ophthalmic surgery.
* **Option D:** Bupivacaine is a potent amide local anesthetic, but it is not typically used in ophthalmic surgery due to its potential for causing toxicity and its longer duration of action, which may increase the risk of complications.

**Clinical Pearl / High-Yield Fact**
When choosing a local anesthetic for ophthalmic surgery, it's essential to select a preservative-free solution to minimize irritation and toxicity. Additionally, ophthalmic local anesthetics should be used in a concentration that is effective for the procedure, but not so high that it causes toxicity.

**Correct Answer: C. Tetracaine**