This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'A 65 years old male diagnosed by biopsy a case of lung carcinoma, with 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: Hypercalcemia is seen in squamous cell carcinoma of lung. The causal mechanism is the production of calcemic humoral substances, most impoantly parathyroid hormone-related protein ( PTHRP) . It has sone biological action similar to PTH. Several other factors like IL-1, TGF, TNF and dihydroxy vitamin D have also been implicated ( Pathologic basis of Disease, 8 th edition)', 'role': 'assistant'}]