Identify the triangle which cannot be constructed:
ΔABC, with m∠A = 70o; m∠B = 50o; AC = 3 cm
ΔABC, with m∠A = 85o; m∠B = 50o; AB = 5 cm
ΔPQR, with m∠Q = 30o; m∠R = 60o; QR = 4.7 cm
ΔLMN, with m∠L = 60o; m∠N = 80o; LM = 5 cm
ΔABC, with m∠A = 85o; m∠B = 50o; AB = 5 cm