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: Pathology
Bloody pericardial effusion can be due to ? 
Select and explain. 
A. Uremic pericarditis, B. Tuberculosis pericarditis, C. Tumour infiltration, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the above