""An Answer to Dr. Pusey's Challenge"" is a book written by John Harrison in 1871. The book is a response to a challenge made by Dr. Pusey regarding the doctrine of the real presence. The real presence is a theological concept that refers to the belief that the body and blood of Jesus Christ are present in the Eucharist, or Holy Communion. Harrison's book provides a detailed explanation of the doctrine of the real presence and defends its validity...