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: Pathology
45 chromosomes are seen in 
Select and explain. 
A. Turner's syndrome, B. Down's syndrome, C. Dentinogenesis imperfecta, D. Treacher's Collins syndrome
A: Turner's syndrome
Answer: A: Turner's syndrome 
Explanation: None