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: Unknown
Which of the following coding system used in ICD-10 is used for “Schizophrenia, schizotypal and delusional disorders”? 
Select and explain. 
A. F10-F19, B. F20-F29, C. F30-F39, D. F40-F48
B: F20-F29
Answer: B: F20-F29 
Explanation: F20-F29
(Ref : ICD-10 WHO)