**Core Concept**
Thermogenesis is the process by which the body generates heat, and Basal Metabolic Rate (BMR) is the minimum energy required by the body at rest to maintain vital functions. An increased BMR is associated with increased thermogenesis.

**Why the Correct Answer is Right**
Increased BMR is associated with increased thermogenesis, which can be due to increased sympathetic nervous system activity, cold exposure, or certain medications such as caffeine and ephedrine. The activation of brown adipose tissue (BAT) is also a key factor in increased thermogenesis, as it is highly metabolically active and generates heat through the uncoupling of oxidative phosphorylation. This process is mediated by the activation of the sympathetic nervous system, which increases the expression of uncoupling protein 1 (UCP1) in BAT.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not directly related to increased BMR.
**Option B:** This option is incorrect because increased BMR is associated with increased thermogenesis, not decreased thermogenesis.
**Option C:** This option is incorrect because increased BMR is associated with increased metabolic rate, not decreased metabolic rate.

**Clinical Pearl / High-Yield Fact**
Cold exposure can increase BMR by activating brown adipose tissue, which can be a useful treatment for obesity and metabolic disorders.

**Correct Answer: D. Increased thermogenesis.**