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: Pharmacology
A patient with ischemic heart disease, diagnosed with migraine; indicated drug in this case is: 
Select and explain. 
A. Propranolol, B. Triptans, C. Ergotamines, D. Butorphanol
D: Butorphanol
Answer: D: Butorphanol 
Explanation: For patients with a history of CAD, triptans or ergotamine are contra-indicated, therefore opioids like intranasal butorphanol should be used for acute severe migraine.