Which of the following is correct about Parthenium (Carrot grass)? (a) Parthenium came into Indi...

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Which of the following is correct about Parthenium (Carrot grass)?
(a) Parthenium came into India as a contaminant with imported wheat
(b) It has become ubiquitous in occurence
(c) It causes pollen allergy
(d) All of the above
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