Which of the following refers to Phenylketonuria - an example of an inborn error of metabolism?

Options :
  1. hormonal overproduction
  2. non disjunction
  3. atrophy of endocrine glands
  4. inherited lack of an enzyme
Answer and Explanation :-

Answer: Option 3


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Should we continue to look upwards? Is the light we can see in the sky one of those which will presently be extinguished? The ideal is terrifying to behold... brilliant but threatened on all sides by the dark forces that surround it: nevertheless, no more in danger than a star in the jaws of the clouds.
-Victor Hugo Les Misérables