If it were Christa and Omid,I want to pick Omid. But considering Christa is most likely pregnant, I'd pick her. But on the other hand, Christa would probably get annoyed at me and wouldn't want to raise a baby, especially with Omid gone, so that is a really tough one.
Kenny and Molly I feel I'd have to pick Kenny. He comes with me, even if I try to go alone, I like Kenny and would feel a complete idiot if I let him die after he insisted on coming, no matter what.