If {x} is the product of all even integers from 1 to x inclusive, what is the greatest prime factor of {22} + {20}?	Choose the correct option.
A) 23
B) 20
C) 11
D) 5
E) 2

Rationale: "soln : { 22 } + { 20 } = 22 * { 20 } + { 20 } = 23 * { 20 } answer : a"
Answer: A