This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
Highest LAP score is seen in: 
Select and explain. 
A. CML, B. Polychthemia vera, C. PNH, D. Pregnancy
B: Polychthemia vera
Answer: B: Polychthemia vera 
Explanation: High levels are seen in: Infection Inflammatory disorder Groeth factor therapy Pregnancy OCP Stress Myeloproliferative disorders Drugs( lithium,coicosteroids.) Abnormally high levels of LAP is seen in myeloproliferative disorder e.g polycythemia vera and myelofibrosis.( ref wintrobes clinical haematology12th/15)