71. The word "malignancy" (Line 1, Para. 1) most probably refers to ____.

1. cancer
2. sickness
3. vitamins
4. disease

72. Preformed vitamin A is NOT found in ____.

1. milk
2. eggs
3. apple
4. cheese

73. Carotene is present in all of the following EXCEPT ____.

1. tomatoes
2. carrots
3. squash
4. butter

74. Among the groups studied, who had the most cases of lung cancer?

1. Those with the lowest level of carotene intake.
2. Those with the highest level of carotene intake.
3. Those who ate only foods containing carotene.
4. Those with the lowest intake of carrots.

75. What is needed to firmly establish the link between carotene and lung cancer?

1. Further study.
2. More money.
3. More cases of lung cancer.
4. More people willing to eat carrots.

(Reference keys.)