**Core Concept**
Ophthalmia neonatorum refers to any conjunctival infection occurring within the first 30 days of life. It is a significant cause of morbidity in newborns and requires prompt diagnosis and treatment to prevent long-term visual impairment.

**Why the Correct Answer is Right**
The correct answer is not specified, but a common treatment for ophthalmia neonatorum includes antibiotics such as erythromycin, gentamicin, or tetracycline. **Ergotamine**, however, is not typically used in the treatment of ophthalmia neonatorum.

**Why Each Wrong Option is Incorrect**
**Option A:** Erythromycin is often used in ophthalmia neonatorum, making this option incorrect.
**Option B:** Gentamicin is a common antibiotic used in the treatment of ophthalmia neonatorum, making this option incorrect.
**Option C:** Tetracycline is also used in the treatment of ophthalmia neonatorum, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
In the treatment of ophthalmia neonatorum, it is essential to cover both Gram-positive and Gram-negative bacteria, as well as Chlamydia and Gonorrhea, with antibiotics such as erythromycin, gentamicin, or tetracycline.

**Correct Answer:** D.