Q. Assertion : Pseudo force is an imaginary force which is recognised only by a non-inertial observer to explain the physical situation according to Newton’s laws.
Reason : Pseudo force has no physical origin, i.e., it is not caused by one of the basic interactions in nature. It does not exist in the action-reaction pair.

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Solution:

Assertion is correct according to newtons law andThe magnitude of this force F is equal to the product of the mass m of the object and acceleration a of the frame of reference. The direction of the force is opposite to the direction of acceleration.
F = - ma
The Reason is also correct
But both are independent as there is no relation between assertion and reason.