Engineering: Engineering is all about the stuff that engineers do such as calculus, buildings and others depending to the types.
Physics: I love astronomy and without physics we wouldn't know anything about astronomy. I am voting for physics because if it weren't for it.
Quantum Mechanics: It is the foundation of all quantum physics including quantum chemistry, quantum field theory, quantum technology, and quantum information science.
Medicinal: Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment.