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: Dental
[{'content': 'An orphan population of 7-13 yrs age has been put on lacto vegetarian diet, which study it was? \nSelect and explain. \nA. Turku study, B. Hope wood house study, C. Vipeholm study, D. Tristan da cunha study', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]