A neonate born to a mother with untreated syphilis later develops notched teeth, interstitial keratitis and sensorineural deafness. Which single triad does this represent?

Answer: A. Hutchinson's triad of late congenital syphilis

Congenital syphilis

Untreated maternal syphilis can cause congenital infection.

Hutchinson's triad (late congenital syphilis)

• Hutchinson's teeth (notched incisors).
• Interstitial keratitis.
• Sensorineural (eighth nerve) deafness.

Other features

• Early: hepatosplenomegaly, fever, rash, failure to thrive.
• Late: saddle nose, sabre tibia, osteochondritis.

Prevention

• Antenatal screening (VDRL) and treatment with penicillin prevent congenital syphilis.

So this is Hutchinson's triad of late congenital syphilis.