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 the Kennedy's classification the posterior unilateral edentulous space is: 
Select and explain. 
A. Class I situation, B. Class II situation, C. Class III situation, D. None of the above
B: Class II situation
Answer: B: Class II situation 
Explanation: None