Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Primary stains are generally 4 millimeters in diameter or greater.
Reason (R): Medium velocity impact spatter occurs when the source of blood is subjected to a force with a velocity in the range of 5 to 25 feet per second.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is not correct
• D. (A) is not correct but (R) is correct

Hint:

Primary stains → Gravity (large size); Medium velocity spatter → Impact force (moderate size). Don’t confuse the two.

Answer 1

The Correct Option is B

Concept: Bloodstain pattern analysis classifies stains based on size, velocity, and mechanism of formation. Primary stains and velocity-based spatter are two distinct concepts.

Step 1: Analyzing Assertion (A).
Primary stains are large blood drops formed under the influence of gravity. These stains are generally larger in size, typically around 4 mm or more in diameter.
Thus, Assertion (A) is correct.

Step 2: Analyzing Reason (R).
Medium velocity impact spatter is produced when blood is subjected to moderate force, typically 5 to 25 feet per second. This produces stains of medium size (1–4 mm).
Thus, Reason (R) is also correct.

Step 3: Evaluating relationship.
Although both statements are correct, the reason does not explain the assertion because:
• Assertion refers to passive (gravity-based) primary stains.
• Reason refers to impact-generated spatter. They belong to different categories of bloodstain formation.

Step 4: Final evaluation.
Thus, both statements are correct, but the reason is not the correct explanation of the assertion. Final Conclusion:
Hence, the correct answer is option (2).