The positioning indicating device (PID) is sometimes called a "cone" because the PID of early dental x-ray machines was of a pointed shape

A) Both the statement and reason are correct and related.
B) Both the statement and reason are correct but not related.
C) The statement is correct, but the reason is not.
D) The statement is not correct, but the reason is correct.
E) Neither the statement nor the reason is correct.

A
Explanation: A) Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.
B) Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.
C) Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.
D) Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.
E) Because cones were used for so many years, many still refer to the open cylinders or rectangular tubes as cones.