A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
The first chemical mutagen discovered was mustard gas. C. Auerbach and her associates first discovered the mutagenic effects of mustard gas and related compounds during World war II. These compounds are examples of a large class of chemical mutagens that transfer alkyl \[(CH_{3}^{-},\,C{{H}_{3}}CH_{2}^{-}\,\text{etc}\text{.})\] groups to the bases in DNA, thus are called alkylating agents.
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