This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intestinal Polyps, Colon & Anal Cancer, Subject name: Pathology
Increase urine levels of 5-HIAA is associated with which condition? 
Select and explain. 
A. Liver Cirrhosis, B. Papillary carcinoma of the Thyroid, C. Carcinoid tumor, D. Small cell carcinoma of the lung
C: Carcinoid tumor
Answer: C: Carcinoid tumor 
Explanation: CARCINOID TUMOR/ Neuroendocrine tumors Arising from enterochromaffin / neuroendocrine cells of respiratory/ gastrointestinal tracts Resulting in over production of Serotonin .