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 patient came to OPD with excessive yawning, lacrimation, hypertension & tachycardia. An examination pupils were found to be dilated. Withdrawl from which of the following has lead to these symptoms? 
Select and explain. 
A. Cannabis, B. Cocaine, C. Morphine, D. Amphetamine
C: Morphine
Answer: C: Morphine 
Explanation: Withdrawl from opioid compounds like Morphine can lead to excessive lacrimation, sweating, rhinorrhea, yawning, mydriasis, myalgia, hypertension & tachycardia.