I think a is the answer to that
Answer: saturated fat that raises your LDL ("bad") cholesterol
Explanation:
Answer: a "psychotic disorder" ; such as: "schizophrenia".
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{<u>Note</u>: Other possibilities include: manic phases of bipolar disorder; bipolar disorder with psychotic disorders; substance use disorder; schizoaffective disorder}.
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They can constrict or dilate because their walls are muscular.