**Core Concept**
Soft contact lenses are made from a type of hydrogel material that is designed to be soft and flexible on the eye. This material allows for the lens to be comfortable to wear and provides good oxygen permeability to the cornea.

**Why the Correct Answer is Right**
The correct answer is a type of hydrogel material called **HEMA (2-Hydroxyethyl methacrylate)**. HEMA is a water-soluble monomer that is commonly used in the production of soft contact lenses. It is a hydrophilic material that is able to retain a large amount of water, making the lens soft and comfortable to wear. The HEMA material is also able to allow for good oxygen permeability to the cornea, which helps to prevent corneal damage and promote healthy vision.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a type of material used in the production of soft contact lenses.
**Option B:** This option is incorrect because it is a type of material used in the production of rigid gas permeable contact lenses, not soft contact lenses.
**Option C:** This option is incorrect because it is a type of material used in the production of intraocular lenses, not soft contact lenses.

**Clinical Pearl / High-Yield Fact**
It's worth noting that the HEMA material used in soft contact lenses can be prone to degradation over time, which can lead to the lens becoming less comfortable to wear. To mitigate this, some contact lens manufacturers have developed new materials that are more resistant to degradation and provide improved comfort and oxygen permeability.

**Correct Answer: C. HEMA (2-Hydroxyethyl methacrylate)**