This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
Orderal poison is? 
Select and explain. 
A. Physostigmine, B. Digoxin, C. Cocaine, D. Atropine
A: Physostigmine
Answer: A: Physostigmine 
Explanation: Ans. (a) PhysostigmineRef.:Medical Toxicology edited by Richard C. Dard 3rd ed/567