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
If both parents are sickle cell anemia patients then the likelyhood of offsprings having the disease is-( 
Select and explain. 
A. 1 0 %, B. 25%, C. 50%, D. 100%
D: 100%
Answer: D: 100% 
Explanation: Ans. is 'd' i.e., 100%