Question

The richest source of vitamin D is:

• A. Fish
• B. Soyabean
• C. Halibut liver oil
• D. Vegetables

Hint:

Concentrated fish liver oils outrank whole fish and plant foods for vitamin D.

Answer 1

The Correct Option is C

Step 1: The query asks for the single most concentrated dietary source of vitamin D from the choices given.

Step 2: Fish liver oils top the list of natural vitamin D sources, and halibut liver oil is even richer than the commonly cited cod liver oil, holding the highest content among the options.

Step 3: Plant items such as soyabean and vegetables carry negligible preformed vitamin D, since the vitamin is largely of animal origin or made in skin by sunlight.

Step 4: Plain fish supplies some vitamin D but cannot match the concentrated liver oil, so halibut liver oil is chosen.

\[\boxed{\text{Halibut liver oil}}\]