This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bleeding Disorders, Subject name: Pathology
Hypercoagulability due to defective factor V gene is called- 
Select and explain. 
A. Lisbon mutation, B. Leiden mutation, C. Antiphospholipid syndrome, D. Inducible thrombocytopenia syndrome
B: Leiden mutation
Answer: B: Leiden mutation 
Explanation: Ans. is 'b' i.e., Leiden mutation