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 boy is having diarrhea, rhinorrhoea, sweating & lacrimation. What is the most probable diagnosis: 
Select and explain. 
A. Cocaine withdrawal, B. Heroin withdrawal, C. Alcohol withdrawal, D. LSD withdrawal
B: Heroin withdrawal
Answer: B: Heroin withdrawal 
Explanation: B i.e. Heroin withdrawal