Which type of vaccine is produced from yeast?

Which of the following statements is not correct?

Consider the following statements about therapeutic drugs:
$I$. The recombinant $DNA$ technology is used for the production of therapeutic drugs which are safe and effective.
$II$. It avoids unwanted immunological responses,commonly observed with similar products isolated from non-human sources.
$III$. About $30$ recombinant therapeutics have been approved for human use in the world,including India.
Which of the statements given above are correct?

$A$ patient is suffering from $ADA$ deficiency. Can he be cured? How?

Which of the following is a correct statement with respect to animal insulin?

Which of the following vectors is used to transfer a functional $ADA$ $cDNA$ into the lymphocytes?