This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
[{'content': 'In parathyroid carcinoma \nSelect and explain. \nA. 5-10% incidence, B. Increased parathromone, decreased calcium in bone, C. Cytology is diagnostic, D. Metastasis is essential', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In Parathyroid carcinoma there is excess release of parathormone which results in increased blood calcium levels and decreased bone calcium level. Cytolologic details are unreliable in its diagnosis whereas invasion of surrounding tissue and metastasis are only reliable. Ref: Robbins and cotrans 9e Pg 1102', 'role': 'assistant'}]