In each freshwater drowning the death occurs within 4-5 minutes of submersion due to ventricular fibrillation. Which of the following reasons is responsible for this?

    A) Total asphyxia is produced due to fresh water.

    B) Laryngospasm causing vagal inhibition.

    C) Haemoconcentration of blood caused by the osmotic
         pressure effect.

    D) Haemodilution, overloading of heart and haemolysis in
         release of Potassium.

Answer: D.

Explanation: 

 in fresh water drowning: Haemodilution, Hypervolaemia, Anoxia, Hyperkalaemia and Hyponatremia will subject the heart to great stress and cause ventricular fibrillation and death in 4-5 minutes.