**Core Concept**
The question is testing the knowledge of taste receptors, specifically the types and their associated taste modalities. Taste receptors are specialized sensory receptors found on the tongue and other parts of the mouth, responsible for detecting chemical molecules in food and drinks, thereby allowing us to experience the five basic tastes: sweet, sour, salty, bitter, and umami.

**Why the Correct Answer is Right**
The correct answer is related to the specific type of taste receptors that respond to sweet substances. Sweet taste is mediated by T1R2/T1R3 receptors, which are a type of G protein-coupled receptor (GPCR). These receptors are activated by sugars and other sweet molecules, triggering a signaling cascade that sends a sweet taste signal to the brain. The T1R2/T1R3 receptor is a heterodimer, meaning it consists of two subunits (T1R2 and T1R3) that work together to recognize sweet molecules.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a type of taste receptor. Taste receptors are a diverse group, and this option is too vague to be correct.
**Option B:** This option is incorrect because it is not a type of taste receptor. While the term "taste receptor" is correct, it does not specify a particular type of receptor, such as T1R2/T1R3.
**Option C:** This option is incorrect because it is related to another type of sensory receptor, not a taste receptor. Olfactory receptors are responsible for detecting odor molecules in the air, not chemical molecules in food and drinks.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the five basic tastes (sweet, sour, salty, bitter, and umami) are mediated by different types of taste receptors. Understanding the specific types of taste receptors and their associated taste modalities is essential for diagnosing and treating taste disorders.

**Correct Answer: C. Olfactory receptors are responsible for detecting odor molecules in the air, not chemical molecules in food and drinks.