### Core Concept
Sweat glands are a type of exocrine gland responsible for producing sweat, a clear, watery secretion that helps regulate body temperature. There are two main types of sweat glands in the human body: eccrine and apocrine glands.

### Why the Correct Answer is Right
Eccrine glands are the most abundant type of sweat gland and are found all over the body, even on the palms and soles. They produce a clear, watery secretion that helps to regulate body temperature through evaporation. Eccrine glands are controlled by the sympathetic nervous system and are activated in response to heat, exercise, or emotional stress. Apocrine glands, on the other hand, are primarily found in the armpits and genital area and produce a thicker, milky secretion that is more involved in pheromone production and skin pH regulation.

### Why Each Wrong Option is Incorrect
**Option A:** Endocrine glands are not sweat glands, as they produce hormones rather than sweat.
**Option B:** Sebaceous glands produce sebum, an oily secretion that helps to moisturize and protect the skin, but are not involved in sweat production.
**Option C:** Mucous glands produce mucus, a thick, protective secretion found in the respiratory, gastrointestinal, and genitourinary tracts, but are not sweat glands.

### Clinical Pearl / High-Yield Fact
It's worth noting that apocrine glands are more prominent in infants and young children, but their activity decreases with age. Eccrine glands, on the other hand, become more active with age and are responsible for most of the body's sweat production.

### Correct Answer: C. Apocrine glands