This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
Which medicine claims to be the world's first organized body of medical knowledge? 
Select and explain. 
A. Indian, B. Chinese, C. Egyptian, D. Mesopotamian
B: Chinese
Answer: B: Chinese 
Explanation: Chinese medicine claims to be the world's first organized body of medical knowledge, dating back to 2700BC, based on 2 principles: yang and yin.