This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Dermatitis Erythema, Subject name: Skin
Most common cause of air borne contact dermatitis is? 
Select and explain. 
A. Parthenium hysterophorus, B. Poison ivy, C. Poison oak, D. Pollen
A: Parthenium hysterophorus
Answer: A: Parthenium hysterophorus 
Explanation: ANSWER: (A) Parthenium hysterophorusREF: Neena khanna 3rd ed p. 86-89Most common cause of:Allergic contact dermatitis due to metal: NickelAllergic contact dermatitis in Indian females: On hands is detergents, on forehead is para tetra butyl phenol in bindi, ear lobule is nickelAir borne contact dermatitis and plant dermatitis is: Parthenium hysterophorousAllergic contact dermatitis due to cosmetics : Balsam of peruAllergic contact dermatitis due to drug: Neomycin