Correct Answer: Boric acid

Solution : The correct option is Boric acid.

Because of its antibacterial and astringent qualities, boric acid is frequently used in prickly heat powder. These substances aid in the prevention of excessive perspiration, and the calming of the skin. Boric acid has long been used to relieve skin pain, irritation, and itching caused by disorders such as prickly heat or heat rash. It can also produce a cooling effect, which is beneficial in hot and humid weather.