This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
Priapism can be due to? 
Select and explain. 
A. C.M.L, B. Myelo-fibrosis, C. A.I.H.A., D. Thrombocytopenia
A: C.M.L
Answer: A: C.M.L 
Explanation: Ans. (a) C.M.LRef: Harrison 19th ed. / 324y 634Priapism is characterized by prolonged, painful and irreducible erection, not resulting in ejaculation. It is an emergency with a poor prognosis, as the risk of impotence is 50%.Causes of Priapism* Sickle cell anemia* Chronic myelogenous leukemia, Chronic lymphocytic leukemia, and acute lymphoblastic leukemia* Drugs