Read the text and choose the correct answer.
Antibiotics, vaccines, human blood-plasma fractions, and steroid hormones are other important pharmaceuticals manufactured from natural substances. Vitamins, which were formerly obtained from natural sources, are now often made in the laboratory. In the preparation of dosages, many pharmaceuticals are ground to varying degrees of fineness. Many medicinal substances are added to water, alcohol, or another solvent so that they can be used in solution form. These may include elixirs and tinctures. Ointments are different semisolid preparations, which include creams, pastes, and jellies.
What substances can be used as solvents of medicals?

• water and alcohol
• creams, pastes, and jellies
• elixirs and tinctures
• semisolid preparations