USMLE step 2 Mcq 58:A 40yr old man working in a chemical factory dealing with nitrates

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Question:
A 40yr old man working in a chemical factory dealing with nitrates presented with generalized headache, dizziness and palpitations work. But as the week progressed in a day or two he recovered.
This phenomena is likely to be secondary to
a) Munchausen's Syndrome
b) Malingering
c) vasodilatation
d) Tachyphylaxis
e) Migraine


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