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: Unknown
Marbling is due to ? 
Select and explain. 
A. Veins becoming visible due to decomposition of blood, B. Clotting ofblood in veins, C. Lightening, D. None of the above
A: Veins becoming visible due to decomposition of blood
Answer: A: Veins becoming visible due to decomposition of blood 
Explanation: Ans-A