<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 15-year-old boy is brought to the emergency department by his father 10 minutes after falling into a frozen lake during ice fishing. He was in the water for less than 1 minute before his father managed to pull him out. On arrival, his clothes are still wet and he appears scared. His body temperature is 36.2C 97.1F, pulse is 102min, blood pressure is 13388 mm Hg. Which of the following mechanisms contributes most to maintaining this patients core body temperature?? A: Increase in hypothalamic set point, B: Involuntary muscular contractions, C: Contraction of arrector pili muscles, D: Inhibition of the thyroid axis, E: Activation of thermogenin,  <response>: This is a question about thermoregulation in a patient with hypothermia after falling into icy water. The key points in the stem are that the 15-year-old boy fell into a frozen lake, was in the water for less than 1 minute, and now has a low body temperature of 36.2C. We need to determine which mechanism is most important for maintaining his core body temperature in this situation.B: Involuntary muscular contractions 