LSAT 120 – Section 3 – Question 14

LSAT 120 - Section 3 - Question 14

October 2005

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT120 S3 Q14
+LR
Weaken +Weak
Causal Reasoning +CausR
Link Assumption +LinkA
A
63%
165
B
10%
162
C
8%
158
D
9%
158
E
10%
160
141
155
170
 +Harder 146.629 +SubsectionMedium

Overexposure to certain wavelengths of strong sunlight is the main cause of melanoma, a virulent form of skin cancer. For this reason, doctors now urge everyone to put adequate sunblock on skin exposed to strong sunlight. Adequate sunblock, according to doctors, is any preparation that prevents sunburn even if the person is exposed to strong sunlight for a significant length of time.

Summarize Argument
People should put adequate sunblock on skin exposed to strong sunlight. This is because adequate sunblock prevents sunburn even if the skin is exposed to strong sunlight for a while, and overexposure to certain wavelengths of strong sunlight is the main cause of melanoma.

Notable Assumptions
The doctors assume there is overlap between the wavelengths of strong sunlight that cause melanoma and the wavelengths of strong sunlight that cause sunburn.

A
There is no evidence that there are wavelengths of sunlight that lead to both sunburn and melanoma.
This weakens the argument. It attacks the doctors’ assumption that the same wavelengths that cause melanoma cause sunburn as well.
B
There are people who have allergic reactions to certain chemicals found in many sunblocks.
This does not affect the doctors’ argument because it is not relevant. These individuals can use one of the sunblocks that do not contain the specific chemicals to which they react.
C
Many sunblocks need repeated applications to remain effective for a significant length of time.
This does not affect the argument. There is nothing in the stimulus to suggest the doctors disagree with this idea.
D
Toxins contained in certain chemical compounds also cause melanoma.
This does not affect the argument. There can be several different causes of melanoma—the doctors are only discussing the main cause, which is overexposure to certain wavelengths of strong sunlight.
E
Sunburns appear immediately after exposure to the sun but melanoma appears years after repeated exposures.
This does not affect the argument. Ideally, if one follows the doctors’ advice, one would not get sunburned in the first place, as they would have applied adequate sunblock.

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LSAT PrepTest 120 Explanations

Section 1 - Logical Reasoning

Section 2 - Reading Comprehension

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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