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INactive hydatid cyst

Q According to WHO-IWGE ultrasonographic classification for Hydatid cyst, inactive cysts belong to which group
a) Group I
b)  Group 2
c) Group 3
d) Group 4

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Answer: C
Reference Bailey and love 27th edition page number 64

WHO Informal Working Group on Echinococcosis (WHO-IWGE) classification
Group 1: Active group – cysts larger than 2 cm and often fertile.
Group 2: Transition group – cysts starting to degenerate and entering a transitional stage because of host resistance or treatment, but may contain viable protoscolices.
Group 3: Inactive group – degenerated, partially or totally calcified cysts; unlikely to contain viable protoscolices.