This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Subject name: Medicine
A 67-year-old smoker is brought to the ER with severe abdominal pain and hypotension. He has a h/o hypeension, asthma and type-2 DM. He currently takes Lisinopril and Metformin. O/E- HR: 100 bpm, BP is 100/60mmHg, S1 & S2- normal, chest- clear. Which of the following risk factors is most likely to have contributed to the development of his underlying condition? 
Select and explain. 
A. Hypeension, B. Smoking, C. Diabetes, D. Family history of cardiovascular disease
B: Smoking
Answer: B: Smoking 
Explanation: This is case of atherosclerosis with Abdominal Aoa Aneurysm If Aneurysm ruptures - Abdominal pain & we know smoking is biggest risk factor of developing atherosclerosis.