Q. Assertion (A) Syphilis, chlamydiasis, Genital herpes and trichomoniasis are STIs.
Reason (R) Their incidences are reportedly high in people belonging years age groups.

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Solution:

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. The correct explanation is as follows
Syphilis, chlamydiasis, genital herpes and trichomoniasis are STIs because they spread from infected person to other through sexual contact or unsafe, unhygienic sexual practices.