A15-year-old boy presents to clinic with his mother with acne on his forehead and nose. he has been using over the counter facial scrubs without relief. physical exam shows multiple closed comedones with mild inflammation on the forehead and nose. he has no significant past medical history and does not smoke or consume alcohol. what is the most appropriate initial pharmacologic therapy?

Topical retinoid

Explanation:

Topical retinoid is a lotion, cream and gel that is being made from vitamin A that is used for the proliferation and used to reduce the keratinization of the skin cells that independent for their functions as a vitamin. Many of the branding creams contain retinol content int their products.  

Uses:

To reduce the moderation of acne, pimple, etc.

It is being used to reduce the scars.

But sometimes it can irritate the skin specially sensitive skin.  

It can increase the chances of sin burn with some people.  

i do believe the correct answer is the spread of chinese culture throughout asia and africa.good luck

explanation:

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.