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: Dental
According to Mahler's theory, normal autistic phase is: 
Select and explain. 
A. 5 - 36 months, B. 4 weeks - 4 years, C. 0 - 1 year, D. 2 - 3 years
C: 0 - 1 year
Answer: C: 0 - 1 year 
Explanation: None