To answer this question, you need to understand the acronym PBI and its common usage.

PBI stands for "Polybenzimidazole," which is a high-performance synthetic fiber known for its excellent heat resistance and flame retardancy. It is typically used in applications that require protection from extreme heat and fire, such as in space suits worn by astronauts.

Now, let's go through each option to understand why it is correct or incorrect:

Option A) Space suits - This option is correct because PBI is indeed used in space suits to provide heat resistance and flame retardancy to protect astronauts. Option B) Nurse's uniforms - This option is incorrect because PBI is not commonly used in nurse's uniforms. Option C) Chef's uniforms - This option is incorrect because PBI is not commonly used in chef's uniforms. Option D) Casual wear - This option is incorrect because PBI is not commonly used in casual wear.

The correct answer is option A) space suits. This option is correct because PBI is typically used in space suits to provide heat resistance and flame retardancy.

• Thanks
• Wrong explanation