The correct answer is Baking soda

• Ant sting or bee sting contains methanoic acid. 
• Methanoic acid is also known as formic acid.
• Bee or ant injects formic acid into our skin while biting.
• Injection of acid by ant or bee results in pain at the place of bite.
• Rubbing baking soda over the skin gives relief from pain due to ant or bee sting.
• Baking soda, which is a base, neutralizes the effect of acid injected by bee or ant.
• Another base, such as zinc carbonate (Calamite solution) is also used in case of ant or bee sting.

• Neutralization
  • When a solution of acid is mixed with the solution of base, both of them neutralize each other and a third substance (called salt) is formed.
  • Such a phenomenon is called neutralization or neutralization reaction.
  • The solution formed because of the mixing of the solution of acid and base is neither acidic nor basic in nature. Such a solution is known as a neutral solution.
  • Acid + Base → Salt + Water
  • Salt formed because of neutralization reaction may be acidic or basic in nature.
  • The acidic or basic nature of salt depends upon the strength of acid and base.
  • In neutralization reaction heat is evolved. Reactions in which heat is evolved are known as exothermic reactions. Thus, the neutralization reaction is an exothermic reaction.