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 primarily due to the presence of 
Select and explain. 
A. Calcium and magnesium sulphates, B. Calcium and magnesium chlorides, C. Calcium and magnesium bicarbonates, D. Calcium and magnesium nitrates
C: Calcium and magnesium bicarbonates
Answer: C: Calcium and magnesium bicarbonates 
Explanation: Temporary hardness (Carbonate hardness) due to Calcium & Magnesium salts of Bicarbonates.