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
Highest LAP score is seen in - 
Select and explain. 
A. CML, B. Polycythemia vera, C. PNH, D. Pregnancy
B: Polycythemia vera
Answer: B: Polycythemia vera 
Explanation: High levels of LAP score are found in:

Infection
Inflammatory disorder
Growth factor therapy
Pregnancy
OCP
Stress
Myeloproliferative disorders (except CML)
Drugs (e.g. Lithium, Corticosteroid, Estrogen)

Abnormally high values of LAP is seen in myeloproliferative disorder e.g. polycythemia vera and myelofibrosis
Decreased LAP score is seen in CML (chronic phase) and PNH (paroxysmal nocturnal hemoglobinuria).