A
Assisted reproductive technologies
B
Drug delivery nanotechnologies
C
Vaccine production technologies
D
Wastewater treatment technologies
Correct answer: (d) Wastewater treatment technologies
Explanation
- A
Assisted reproductive technologies
Assisted reproduction. That is IVF / ICSI, not MBR.
- B
Drug delivery nanotechnologies
Drug-delivery nanotech. Different membranes.
- C
Vaccine production technologies
Vaccine production. Not the usual MBR headline.
- D
Wastewater treatment technologies
Wastewater treatment. Membrane bioreactors combine activated sludge with membrane filtration.
Summary. Official key is (d) wastewater treatment. A membrane bioreactor (MBR) couples biological treatment with a membrane to separate sludge from treated water. It is a sewage / industrial-effluent technology, not IVF or vaccines.