This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Myocardial Infraction, Subject name: Pathology
Which of the following is a non-modifiable risk factor for CHD - 
Select and explain. 
A. Diabetes, B. Smoking, C. Hypertension, D. Old age
D: Old age
Answer: D: Old age 
Explanation: Ans. is 6d' i.e., Old age o Old age is a non-modiflable risk factor for atherosclerosis and coronary heart disease (CHD).o Other three (given in question) are modifiable risk factors.Risk factors for atherosclerosis and coronary heart diseaseModifiableo Hyperlipidemiao Diabeteso Trans-unsaturated fat intakeo Hypertensiono Alcoholo Chlamydia pneumonaeo Cigarette smokingo Lipoprotein (a)o CMVo Physical inactivity Nonmodifiableo Old ageo Obesityo Stress (type 'A' personality)o Male gendero Postmenopausalo Homocysteineo Family historyo Prothrombotic factors