Thyroid hormones increase the rate of metabolism in cells throughout the body. Thyroxine, a thyroid hormone, is an aryl iodide. Thyroxine increase the rate of metabolism in cells throughout the body.is the reasoning for what question and answer pair?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: What increases the rate of metabolism in cells throughout the body?
Options:
- (A) Thyroxine
- (B) Smoking
- (C) fever
- (D) bioaerosols
- (E) acetic acid
- (F) sweating
- (G) Power plants
- (H) heat produced
A: (A)