Most common phobia is

The phobia is defined as an irrational fear of a specific object, situation or activity, often leading to persistent avoidance of the feared object, situation or activity Types- agoraphobia, social phobia and specific phobia Agoraphobia is an example of irrational fear of situations. It is the commonest type of phobia encountered in clinical practice (Ref: A sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no 92)