Difficulty: 1

What causes blackheads on skin?

Explanation:

Blackheads are caused by pores clogged with oil and dead cells, oxidized.

'Bacteria': Wrong, causes pustules, not blackheads.
'Virus': Wrong, not related to blackheads.
'Fungus': Wrong, causes other skin diseases, not blackheads.
A
Clogged pores.
B
Fungus.
C
Bacteria.
D
Virus.
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