'X' is a chemical present in our stomach and is necessary for the digestion of food. When 'X' is secreted in excess, it causes health problem like indigestion. 'Y' is a chemical used to treat this condition. What could be 'X' and 'Y'?

• A. X is hydrochloric acid & Y is sodium carbonate
• B. X is milk of magnesia & Y is hydrochloric acid
• C. X is hydrochloric acid & Y is milk of magnesia
• D. X is milk of magnesia & Y is ascorbic acid