Pick from: [i] the environment; [ii] heating liquids; [iii] warm rooms; [iv] comfort; [v] cold water; [vi] survive; [vii] Animal survival; [viii] tepid water;
Given those answer options, answer the question: Fact 1: Mammals can also generate little bursts of heat by shivering. Fact 2: Intense shivering and severe pain are natural body reflexes to cold water. Given the two facts above, mammals can also generate little bursts of heat using natural body reflexes to what?
A:
[v]