This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Social science, Mental health & Genetics, Subject name: Social & Preventive Medicine
true statement is 
Select and explain. 
A. A man can live without society, B. A crowd can be a society and a society cannot be a crowd, C. Society constrains individual effos, D. Modern society do not follow customs
C: Society constrains individual effos
Answer: C: Society constrains individual effos 
Explanation: Ref: 25th Ed Park's Textbook of Preventive and Social Medicine