challenge: What are the three related factors known as Virchow's Triad that contribute to the formation of blood clots, including Renal vein thrombosis?
  
  A. Decrease in blood flow, increase in blood pressure, decrease in blood volume
  B. Increase in blood viscosity, damage to the heart, decrease in blood pressure
  C. Damage to the liver, increased blood flow, decreased coagulability
  D. Damage to the blood vessel, decrease in blood flow, increased coagulability of the blood
  Answer: 