2. Read the passage given below.
1. Autism spectrum disorders (ASD) are a range of psychological conditions characterized
by abnormalities in social interaction behaviour, interests, and communication.
Although the number of reported cases of ASD has experienced a dramatic increase in
the past 25 years, the majority of doctors agree that this increase is due to changes in
diagnostic practices and advances in the understanding of psychiatric health. While
there is no general consensus among medical professionals about the underlying causes
of ASD, theories range from genetic inheritance to environmental factors. One of the
most controversial theories to have emerged In recent times is the hypothesis that ASD
could be caused by the MMR vaccine, which is an immunization against measles, mumps,
and rubella that was first developed in the 1960's. The vaccine is a mixture of three live
viruses and is administered via injection to children when they are one year old. By the
late 1990's, this vaccination had led to the near-eradication of measles in countries that
primary purpose of the passage
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