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
Which of the following is an example of monarchy? 
Select and explain. 
A. UK, B. India, C. Thailand, D. Poland
A: UK
Answer: A: UK 
Explanation: In a monarchy, the head of the state is a monarch. Examples include UK. Ref: Park 21st edition page: 632.