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
First quartile of the following data is - 1, 3, 4, 2 
Select and explain. 
A. 1, B. 3, C. 1.5, D. 4
C: 1.5
Answer: C: 1.5 
Explanation: None