A 39 year old man has 7 kg unintentional weight loss

A 39 year old man has 7 kg unintentional weight loss in the last two months despite
having good appetite. He also complains of palpitations, sweating and diarrhoea. He
has a lump in front of his neck which moves on swallowing. What is the SINGLE most
appropriate diagnosis?
A. Lymphoma
B. Tuberculous lymphadenitis
C. Thyroid Cancer
D. Goiter
E. Thyroid cyst