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: Dental
Most common underlying neoplasm associated with paraneoplastic pemphigus is: 
Select and explain. 
A. Thymoma, B. Non-Hodjkin's lymphoma, C. CLL, D. Medullary carcinoma of thyroid
B: Non-Hodjkin's lymphoma
Answer: B: Non-Hodjkin's lymphoma 
Explanation: NHL : most common neoplasm associated with paraneoplastic pemphigus