Hey there,
Answer:
<em />Hepatitis
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B because the genotypes of the parents would be Pp because they are heterozygous. The genotypes they could inherit are PP, Pp, Pp or pp.

Pollen grain is odd one among all the other three. Pollen grain in a male gametophytic structure. Whereas all the other three are found inside ovule (nucellus, micropyle and embryo sac).
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2 and 3 i think should be right
The common denominator is 8, hope this helps.