**Core Concept**
Toxic amblyopia is a condition where there is a reduction in vision due to the toxic effect of certain substances on the optic nerve or retina. The treatment involves the use of vitamins and other supplements to alleviate the condition.

**Why the Correct Answer is Right**
The correct answer is a vitamin that has been used to treat toxic amblyopia due to its role in maintaining the health of the retina and optic nerve. This vitamin is particularly useful in cases where the condition is caused by the use of certain medications or substances. The mechanism of action involves the prevention of damage to the optic nerve and retina, allowing for the restoration of normal vision.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not have a direct role in treating toxic amblyopia.
**Option B:** This option is incorrect because it is not typically used to treat conditions affecting the retina and optic nerve.
**Option C:** This option is incorrect because it is not directly involved in the treatment of toxic amblyopia.

**Clinical Pearl / High-Yield Fact**
The use of vitamins in the treatment of toxic amblyopia highlights the importance of nutritional supplements in maintaining ocular health. This is particularly relevant in cases where the condition is caused by the use of certain medications or substances.

**Correct Answer:** B. Riboflavin (Vitamin B2) is used to treat Barbiturate-induced toxic amblyopia