This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Psychiatry
A medical student could not deliver a seminar, fearing seniors. He is aware of the irrationality of his fear. Likely diagnosis is - 
Select and explain. 
A. Agoraphobia, B. Social phobia, C. Claustrophobia, D. Specific phobia
B: Social phobia
Answer: B: Social phobia 
Explanation: It is typical example of social phobia in which the medical student has irrational fear of performing activity (delivering seminar) in front of seniors (scrunity by seniors).