31.Which of the following features are shared by Retin-A and Accutane?

a.They are teratogenic.

b.They are highly toxic.

c.They are usually taken orally.

d.They have chemical structures similar to vitamin A.

32.What population group is most vulnerable to vitamin A toxicity?

a.children

b.adolescents

c.adults

d.elderly

33.Which of the following is a feature of taking high-dose supplements of vitamin A?

a.They increase teratogenic risk.

b.They are effective in treating acne.

c.They lead to keratinization of tissue

d.They reduce risk for neural tube defects

34.What is the preferred unit of expression of vitamin A?

a.milligram

b.global unit

c.international unit

d.retinol activity equivalent

35.Which of the following is a feature of Accutane?

a.It is effective in treating rickets.

b.It is less toxic than pure vitamin A.

c.It is known to be effective in treating mild but not severe acne.

d.It is known to cause birth defects when used by pregnant women.

36.Which of the following is a characteristic of excess consumption of beta-carotene?

a.Overconsumption prevents birth defects.

b.Overconsumption from supplements is harmless.

c.Drinking alcohol worsens the adverse effects of supplements.

d.Massive doses decrease the incidence of acne.

37.How many micrograms of dietary beta-carotene are equivalent to 1 retinol activity equivalent?

a.2 µg

b.4 µg

c.8 µg

d.12 µg

38.On average, 1 retinol activity equivalent is equal to about how many international units?

a.3 IU

b.5 IU

c.8 IU

d.10 IU

39.Which of the following is the most likely side effect for a person who regularly consumes large quantities of carrots or carrot juice?

a.bone pain

b.dermatitis

c.skin yellowing

d.vitamin A toxicity

40.Why shouldn’t a 7-month pregnant woman be prescribed Accutane?

a.It may aggravate existing edema.

b.It may lead to prolongation of labour.

c.It is a teratogen and can be harmful to the baby.

d.It contains high concentrations of vitamin D that can cause birth defects.