Ans.
Vitamin E is fat soluble complex, made up of eight units. It plays an important role in antioxidation reactions in plasma membranes. If a biochemist is showing the recommended daily requirement of vitamin E should be twice from 9 mg/day to 18 mg/day, a good question about his experiment after reading conclusions of his experiment is to ask about group of people on which he performed experiment.
The change in recommended daily allowance to twice of vitamin E may due to vitamin E deficiency in group of people, who were selected by the biochemist for his experiment. Thus, the correct answer is 'option on what group(s) of people did the biochemist perform his experiment?'
As he suggested to increase the amount of vitamin E, so it cannot be toxic to humans. Molecular formula of vitamin E (C29H50O2), given by biochemist is showing that it is the alpha-tocopherol, which is a hydrophobic or fat soluble compound.
