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: Social & Preventive Medicine
[{'content': 'Which of the following countries were NOT included in the MGRS study leading to the development of 2006 WHO growth chas? \nSelect and explain. \nA. Norway, B. Nigeria, C. India, D. USA', 'role': 'user'}, {'content': 'Answer: B \nExplanation: A Multicentre Growth Reference Study was undeaken between 1997 to 2003 in 6 countries including India, Ghana, Brazil, Norway, USA and Oman. Growth related data was accumulated in 9440 healthy breast fed babies. They were followed up from 0-60 months. In 2006, the WHO growth chas were published based on these data. Ref: Park, 21st Edition, Page 502.', 'role': 'assistant'}]