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
Inherited coagulation disorder - 
Select and explain. 
A. Protein C deficiency, B. Protein S deficiency, C. Leiden factor, D. All
D: All
Answer: D: All 
Explanation: Ans. is 'a' i.e., Protein - C deficiency; 'b' i.e., Protein - S deficiency; 'c' i.e., Leiden factor