**Core Concept**
The cat's eye reflex, also known as the Arlt's line, is a sign of congenital rubella syndrome, which is a condition caused by the rubella virus affecting a fetus during pregnancy. It is characterized by a white or grayish-white line at the junction of the cornea and iris.

**Why the Correct Answer is Right**
The presence of a cat's eye reflex in a one-year-old male child suggests that he was infected with the rubella virus in utero, likely due to his mother's rubella infection during pregnancy. This infection can lead to various congenital abnormalities, including vision problems, hearing loss, and heart defects. The raised intraocular tension (IOT) in this child may be a result of the congenital glaucoma, a common complication of congenital rubella syndrome.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the cat's eye reflex or congenital rubella syndrome.
**Option B:** This option may be related to other conditions, such as uveitis or trauma, but not specifically to the cat's eye reflex.
**Option C:** This option is not directly related to the cat's eye reflex or congenital rubella syndrome.

**Clinical Pearl / High-Yield Fact**
The cat's eye reflex is a classic sign of congenital rubella syndrome, and its presence in a child should prompt further investigation for other congenital abnormalities.

**Correct Answer:** C. Congenital rubella syndrome.