A man presented with bilateral crepitations in the base of the lungs and signs of pneumonitis with a history of exposure to pigeon feces. Which of the following is true about this condition?: (A) Diagnosis can be made on the basis of history, (B) CT scan is investigation of choice, (C) Chest X-ray will reveal characteristic changes, (D) It is type I hypersensitivity reaction
Answer is A. Ans. a. Diagnosis can be made on the basis of history