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
A 65 years old male diagnosed by biopsy as a case of lung carcinoma, with the paraneoplastic syndrome and increased PTH. Probable cause is- 
Select and explain. 
A. Parathyroid, B. Parathyroid related peptide, C. Calcitonin, D. Calcitonin related peptide
B: Parathyroid related peptide
Answer: B: Parathyroid related peptide 
Explanation: None