Most common plant implicated in the causation of dermatitis is: (A) Cotton fibres, (B) Poison ivy, (C) Pahenium grass, (D) Ragweed
Answer is C. Pahenium dermatitis is caused by dry powder of leaves and flowers and hair-like structures (trichomes). Sesquiterpene lactones (SQLs) are the most impoant allergens responsible for ACD to pahenium. Ref Harrison20th edition pg 1234