This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anxiety disorders stress disorders and grief, Subject name: Psychiatry
Phobia is defined as 
Select and explain. 
A. Palpitation on thinking about a definite entity, B. Excessive unreasonable fear about a specific situation, C. Perception without stimulation, D. Altered perception
B: Excessive unreasonable fear about a specific situation
Answer: B: Excessive unreasonable fear about a specific situation 
Explanation: Phobia is defined as an irrational fear of a specific object, situation or activity, often leading o persistent avoidance of the feared object, situation or activity. Common types Agoraphobia Social phobia Specific phobia (Ref: A sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no 92)