Discussion
Assertion (A) : Blood stains on cloth should be collected after drying in shade under room heater.
Reason (R) : It causes disintegration of blood stains.
Answer: D
The assertion is incorrect and the reason is correct. Blood-stained cloth should be dried in shade at ordinary room temperature, away from direct heat and sunlight, so a room heater is the wrong way to dry it. Heat does break down the blood stain and denature its proteins, which is why the reason is a true statement.
Option (A), (B) and (C) therefore all fail: (A) calls the assertion correct, (B) says the reason is wrong, and (C) says the assertion is correct while the reason is not. Only (D), assertion incorrect and reason correct, matches the facts.
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