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: Gynaecology & Obstetrics
In a case of carcinoma cervix involvement of parametrium, lower 1/3 of vagina and no free space on P/R examination means stage : 
Select and explain. 
A. Ila, B. Ilb, C. Illa, D. Illb
B: Ilb
Answer: B: Ilb 
Explanation: Ilb