Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction.
Reason: Dip needle will stay vertical at the north pole of the earth.
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true and reason is not the correct explanation of assertion
(c) Assertion is true but reason is false
(d) Assertion is false and reason is true
