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': 'Road -to health cha was given by- \nSelect and explain. \nA. John Snow, B. David Morley, C. Koch, D. Henrey Ducant', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., David morley Growth cha o Also known as "road-to-health" cha. It was first designed by David morley. o It is a visible display of the child\'s physical growth and development. o It is designed primarily for the longitudinal follow-up (growth monitoring) of child. o Mostly weight for age is taken into consideration (height is not taken into consideration). o This is because weight is the most sensitive measure of growth and any detion from normal can be detected easily by comparison with reference curves. A child can lose weight but not height. The growth cha offers a simple and inexpensive way of monitoring weight gain and infact child health oveime.', 'role': 'assistant'}]