**Core Concept**
Breslau's second life test, also known as the second life test, is a method used to determine the viability of a fetus. It is based on the principle that a viable fetus will respond to stimuli by showing signs of life, such as movement, breathing, and heart rate.

**Why the Correct Answer is Right**
The second life test is a non-invasive method that assesses the fetus's response to external stimuli, such as a loud noise or a sharp object. A viable fetus will show signs of life in response to these stimuli. This test is based on the concept that a viable fetus will have a functioning nervous system and will respond to external stimuli.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the second life test is not based on the measurement of fetal heart rate or the presence of fetal movement, although these are important indicators of fetal viability.
**Option B:** This option is incorrect because the second life test is not a laboratory-based test that requires specialized equipment, but rather a simple observation of the fetus's response to external stimuli.
**Option C:** This option is incorrect because the second life test is not a method of determining fetal age or gestational age, but rather a method of determining fetal viability.

**Clinical Pearl / High-Yield Fact**
A key aspect of the second life test is the observation of the fetus's response to external stimuli, which is an important indicator of fetal viability. This test is often performed in conjunction with other methods of assessing fetal viability, such as ultrasound and non-stress testing.

**Correct Answer: D. Breslau's second life test utilizes a loud noise or sharp object to stimulate the fetus and assess its response.**