This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Oakley-Fulthorpe procedure is: 
Select and explain. 
A. Single diffusion in one dimension, B. Double diffusion in one dimension, C. Single diffusion in two dimensions, D. Double diffusion in two dimensions
B: Double diffusion in one dimension
Answer: B: Double diffusion in one dimension 
Explanation: *Various immunodiffusion test *Single diffusion in one dimension - Oudin procedure *Double diffusion in one dimension - Oakley fulthorpe procedure *Single diffusion in two dimensions - Radial immunodiffusion *Double diffusion in two dimensions - Ouchterlony procedure