This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms & Signs , Subject name: Psychiatry
Doppelganger is - 
Select and explain. 
A. Shadow following person, B. Feeling of double of oneself, C. Indentification of stranger as familiar, D. None of the above
B: Feeling of double of oneself
Answer: B: Feeling of double of oneself 
Explanation: Ans. is 'b' i.e., Feeling of double of oneself o Doppelgangers (subjective double) is the delusion that there is double of oneself. A person feels that double of himself exists elswhere.