B. Inhalant
I hate this 20 words thingy -_-
Answer: Double blind clinical trial
Explanation:
The situation that is seen here is double blind clinical trail in which neither the participant nor the practitioner knows who is receiving the treatment.
This is used to prevent biasing in the experiment which is caused due to demand characteristics or placebo effect.
Here, in this situation the dog handlers and the experimental observer both were blinded to identify the breath sample.
Answer – Iron
According to guidelines stated in the “Guidance for Industry: Food Labeling Guide” published by the U.S Food and Drug Administration (FDA) in September 1994 and last revised in January 2013, it is required that Vitamin A, Vitamin C, Calcium, and Iron must appear on nutritional labels if they are contained in the food.
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