This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Temporary hardness of water is due to 
Select and explain. 
A. Calcium and magnesium Bicarbonate, B. Calcium and magnesium carbonate, C. Potassium carbonate, D. Chlorine
A: Calcium and magnesium Bicarbonate
Answer: A: Calcium and magnesium Bicarbonate 
Explanation: None