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
Alkaline phosphatase level on serum is not increased in - 
Select and explain. 
A. Paget's disease, B. Multiple myeloma, C. Hyperparathyroidism, D. Osteomalacia
B: Multiple myeloma
Answer: B: Multiple myeloma 
Explanation: Important Causes of raised alkaline phosphatase.

Bone diseases - Paget disease, Osteomalacia, rickets, hyperparathyroidism, fresh fracture, Vit D deficiency. Metastatic bone tumors.
Obstructive biliary tract disease - Primary biliary Cirrhosis, biliary stone, Primary sclerosing cholangitis.
Hepatic causes - Infiltrative granulomatous hepatitis, sarcoidosis, amyloidosis, malignancy, viral hepatitis.
Drugs - Estrogen, Chlorpromazine, erythromycin.
Placental - Pregnancy, post menopausal, tumors.