This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
The 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: Cyanide sometimes is described as having a "bitter almond" smell Garlic odor: Thallium Organophosphate Toxicity Arsenic Poisoning Dimethyl Sulfoxide Sulfur Mustard Phosphite Ref: Krishan Vij textbook of forensic medicine, 5th edition pg : 554