1. The problem statement, all variables and given/known data The intial step in the digestion of milk in Humans is carried out by which of the following enzymes? A) lipase B) trypsin C) rennin (No, not renin) D) pepsin 2. Relevant equations Casein is converted to Paracasein by rennin and then paracasein along with calcium is acted upon by pepsin to break into peptones. 3. The attempt at a solution I know that rennin is secreated only in infants in humans and the question that i posted here (as given in my national level exam) asks "humans" which baffels me. 'cause i don't get whether they are asking adult humans only or humans in general (where infancy also included). And in a grown up adult, rennin is not secreated and it's function is carried out by pepsin. so to this question, between option C and D which one will be more appropriate (accurate)? PS: it's not a multiple correct answer question but a single correct answer question where a wrong answer will lead to -1 mark. so please help me with this question.