The internal secretion of which of the following acids helps in digestion?

Options :
  1. Citric acid
  2. Sulphuric acid
  3. Acetic acid
  4. Hydrochloric acid

Answer and Explanation :-

Answer: Option 4


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My theory is that hope is a form of madness. A benevolent one, sure, but madness all the same. Like an irrational superstition--broken mirrors and so forth--hope's not based on any kind of logic, it's just unfettered optimism, grounded in nothing but faith in things beyond our control.
-Benjamin Wood The Bellwether Revivals