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
[{'content': 'A 65 years old male diagnosed by biopsy as a case of lung carcinoma, with the paraneoplastic syndrome and increased PTH. Probable cause is- \nSelect and explain. \nA. Parathyroid, B. Parathyroid related peptide, C. Calcitonin, D. Calcitonin related peptide', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]