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: Forensic Medicine
Smell of bitter almonds is seen in poisoning with : 
Select and explain. 
A. Phosphorus, B. Hydrocyanic acid, C. Nitric acid, D. Oxalic acid
B: Hydrocyanic acid
Answer: B: Hydrocyanic acid 
Explanation: B i.e. Hydrocyanic acid