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': 'Serum marker of rickets is \nSelect and explain. \nA. Acid phosphates, B. Alkaline phosphatase, C. Decreased serum calcium, D. Urinary posphates', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amongst the given options, alkaline phosphatase is best because it is raised in all type of rickets.\nThe primary (Basic) investigations in a child of rickets are :-\n\n\nSerum calcium\nSerum phosphorus\nAlkaline phosphatase\n\n\nIf the patient does not respond to calcium and Vit D therapy, secondary investigations are done:-\n\n\nVit D level\nSerum PTH\nUrinary calcium and phosphorus.', 'role': 'assistant'}]