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
Disease having autosomal recessive inheritance -a) Cystic fibrosisb)  Hydrocephalusc)  Duchene muscular dystrophyd) Albinisme)  Vitamin D resistant ricket 
Select and explain. 
A. b, B. ad, C. ac, D. ab
B: ad
Answer: B: ad 
Explanation: None