Which of the following statements about non-allergic asthma is not correct? A. it generally shows later onset and greater severity B. it is often triggered by occupational exposure to fumes/dusts C. it generally shows chronic rather than episodic pattern D. it shows no evidence of allergy on testing E. it typically shows positive family history of asthma Which of the following statements about non-allergic asthma is not correct? A. it generally shows later onset and greater severity B. it is often triggered by occupational exposure to fumes/dusts C. it generally shows chronic rather than episodic pattern D. it shows no evidence of allergy on testing E. it typically shows positive family history of asthma.